SSH connection multiplexing
Fix status issue : was sometimes reporting modified content erroneously
SSH Multiplexing : don't pass ControlPersist to ssh<5.6
README: group permissions for shared remotes
Don't try to multiplex SSH connections on msys (not supported with privilege separation
Check ssh connectivity before deliveries
Gitignore for Vim swap files and backup files
Update documentation regarding SSH connection multiplexing and its unavailability on msys.
Remove unused 'mem-free' script in core preset