remove docs/misc/create_compression.txt

outdated - it just showed different levels of zlib compression,
but not we additionally have "lzma", "lz4" and "none" compression.
the "usage" and "internals" docs give some hints about them, too.

docs/misc/create_compression.txt

@@ -1,130 +0,0 @@
-data compression
-================
-
-borg create --compression N repo::archive data
-
-Currently, borg only supports zlib compression. There are plans to expand this
-to other, faster or better compression algorithms in the future.
-
-N == 0 -> zlib level 0 == very quick, no compression
-N == 1 -> zlib level 1 == quick, low compression
-...
-N == 9 -> zlib level 9 == slow, high compression
-
-Measurements made on a Haswell Ultrabook, SSD storage, Linux.
-
-
-Example 1: lots of relatively small text files (linux kernel src)
------------------------------------------------------------------
-
-N == 1 does a good job here, it saves the additional time needed for
-compression because it needs to store less into storage (see N == 0).
-
-N == 6 is also quite ok, a little slower, a little less repo size.
-6 was the old default of borg.
-
-High compression levels only give a little more compression, but take a lot
-of cpu time.
-
-$ borg create --stats --compression 0
------------------------------------------------------------------------------- 
-Duration: 50.40 seconds
-Number of files: 72890
-
-                       Original size      Compressed size    Deduplicated size
-This archive:                1.17 GB              1.18 GB              1.01 GB
-
-                       Unique chunks         Total chunks
-Chunk index:                   70263                82309
------------------------------------------------------------------------------- 
-
-$ borg create --stats --compression 1
------------------------------------------------------------------------------- 
-Duration: 49.29 seconds
-Number of files: 72890
-
-                       Original size      Compressed size    Deduplicated size
-This archive:                1.17 GB            368.62 MB            295.22 MB
-
-                       Unique chunks         Total chunks
-Chunk index:                   70280                82326
-------------------------------------------------------------------------------
-
-$ borg create --stats --compression 5
------------------------------------------------------------------------------- 
-Duration: 59.99 seconds
-Number of files: 72890
-
-                       Original size      Compressed size    Deduplicated size
-This archive:                1.17 GB            331.70 MB            262.20 MB
-
-                       Unique chunks         Total chunks
-Chunk index:                   70290                82336
-------------------------------------------------------------------------------
-
-$ borg create --stats --compression 6
------------------------------------------------------------------------------- 
-Duration: 1 minutes 13.64 seconds
-Number of files: 72890
-
-                       Original size      Compressed size    Deduplicated size
-This archive:                1.17 GB            328.79 MB            259.56 MB
-
-                       Unique chunks         Total chunks
-Chunk index:                   70279                82325
-------------------------------------------------------------------------------
-
-$ borg create --stats --compression 9
-------------------------------------------------------------------------------
-Duration: 3 minutes 1.58 seconds
-Number of files: 72890
-
-                       Original size      Compressed size    Deduplicated size
-This archive:                1.17 GB            326.57 MB            257.57 MB
-
-                       Unique chunks         Total chunks
-Chunk index:                   70292                82338
-------------------------------------------------------------------------------
-
-
-Example 2: large VM disk file (sparse file)
--------------------------------------------
-
-The file's directory size is 80GB, but a lot of it is sparse (and reads as
-zeros).
-
-$ borg create --stats --compression 0
-------------------------------------------------------------------------------
-Duration: 13 minutes 48.47 seconds
-Number of files: 1
-
-                       Original size      Compressed size    Deduplicated size
-This archive:               80.54 GB             80.55 GB             10.87 GB
-
-                       Unique chunks         Total chunks
-Chunk index:                  147307               177109
-------------------------------------------------------------------------------
-
-$ borg create --stats --compression 1
-------------------------------------------------------------------------------
-Duration: 15 minutes 31.34 seconds
-Number of files: 1
-
-                       Original size      Compressed size    Deduplicated size
-This archive:               80.54 GB              6.68 GB              5.67 GB
-
-                       Unique chunks         Total chunks
-Chunk index:                  147309               177111
-------------------------------------------------------------------------------
-
-$ borg create --stats --compression 6
-------------------------------------------------------------------------------
-Duration: 18 minutes 57.54 seconds
-Number of files: 1
-
-                       Original size      Compressed size    Deduplicated size
-This archive:               80.54 GB              6.19 GB              5.44 GB
-
-                       Unique chunks         Total chunks
-Chunk index:                  147307               177109
-------------------------------------------------------------------------------