Handling exception where config file is not parsable.  Also brought code back into PEP8 compliance.
Demonstrating a cleaner way to specify multiple archives to back up (one per line specified in config file)
bugfix: When checking to see if archive directories are readable, don't give up looking for a test file if none is found in the root directory (i.e. do a recursive search for files).
Detecting condition where a directory has *no* files, in which case the readability test will fail.