fix
fix
handle files that have been updated since the last start of locdat; checksum is now not directly calculated on initialization of a File and is set to None instead -> if a File is compared and its checksum is still None, then calculate checksum and act accordingly
throw OSError when trying to receive not existent path
make sure FileSystem works with relative paths
since checksum is calculated when file has been received, use this calculated checksum and attach it to the file
slightly changes how FileSyncManager and the 'network' are communicating with each other
changed _send_list
handle the received file/dir list in a better way
implement send_request_list and the handleing of the received file/dir list
modified docs
FINALLY fixed the FileSystem operations and made them safe for use