Change the Rsync remote path field's max_length

Warn the user about it being truncated

When rsyncing over SSH do a brief ssh if exist's check
for the remote directory to let the user know that the
remote path he specified does not exist and he either needs
to verify his data and/or do one of the following:
1. Create the directory on the remote machine himself
2. Check a rync_create field (which is now added to the form)

This way we can also check to see if the ssh link works
before saving the form data and thus avoid any further problems