#394 Command line options for MAX compression

[Sanmayce]

Hi Igor,
please share the command line for achieving maximum compression with LZMA2 on textual data.

My wish is to include 7za v19.00 in textual compression comparison where all compressors operate with their max settings for text-like data:
https://www.overclock.net/threads/choosing-a-modern-archiver-what-matters-most.1792407/

I wish the block to be 1536MB and to use 4 threads as a minimum, (8 if 58GB are enough).
Also, to use other settings favoring its max performance.

The best I got at the moment is:

timer64 "7za_x64_v1900.exe" a -t7z -mx=9 -mfb=273 -md=1536m -mmt=4 "%1.7z" "%1"

In case your new alpha revisions are better then please share them as well.