remove file extension ".gz" on filepart
Merge branch 'master' into master+filepart_without_gz
Merge branch 'master' into master+filepart_without_gz
add batch file renamer to strip the .gz extensions

The agent ask the filepart without any extension and actually the Fusioninventory plugin's
repository may be the source of simple HTTP mirrors.
If we kept extension, mirrors will not be able to do incremental synchronization because they would
have to always rename those files.

This fixes #1999
update README according to new code added