force use of python 2.x interpreter, update copyright and version

use 2to3 to make compatible with python3

Updated copyright.

Reverted to older form of 'exception' statement for compatibility with legacy python installations.

Got rid of extra brackets in usage summary line.

Minor comment cleanup.

Changed how slice parsing takes place to allow constructs like -T3:-4 to work.

Fixed bug in case-insensitive replacement introduced by last checkin.

Fixed bugs introduced by -T logic. This removed the 'name' variable from ProcessRenameRequests().

Minor comment change.

BUGFIX: Backups were being incorrectly named and created.

Fixed oldname intialization bug introduced during -T implementation.

Finished implementing -T option.

First cut at renaming target substring selection (-T). Still incomplete.

Added -e to command line string template in usage output.

Implemented /NAMESOFAR/ renaming token.

Fixed problem wherein nonexistent files or wildcards named as rename targets would be silently ignored.

Fixed misleading comment.

Implemented debug support for showing the sequence of renaming steps.

Sorted list of case conversion options displayed when user enters one that is invalid.

Finished implementing case conversion renaming request support.

Added support for case conversion function dispatch table and command validation of such requests.

Put in basic scaffolding for forced case conversions.

Removed trailing period from renaming information message.

Fixed $TREN parsing to use shlex.split instead of splitting on spaces.

Fixed bug in include file processing - line is now parsed with shlex.split().

Implemented TRENINCL path search support for include files.

Ordered alphabet entries by name. ...

Mac/Win fix so that backup files would not be saved under new name when only change was character case.
Fixed SRT parsing so it properly distinguishes between a bad token name and a bad alphabet name.

Minor change to alphabet error messages.

Minor cleanup.