Merge branch 'sfind' into 'master'

directory optimization with compression and reattemp

* Refactor sfind so it can use SLURM\_ environment variables to ask to different servers.
* Create a sample bash script to gather all the info (map-\>reduce)
* Compress directory data with zstd.
* Make a new config.hpp option for controlling the compression
* If directory buffer is not enough it will reattempt with the exact size
* Issues related : #372 , #371 , #370

See merge request !270