From SF patch #852334.

Use != instead of <> since <> is documented as "obsolescent".
Use "is" and "is not" when comparing with None or type objects.

genuine bug, so I checked it in separately.

Also use CDDB_PATH and CDDB_WRITE_DIR environment variables in cddb.py.

* Several modules: change "class C(): ..." to "class C: ...".
* flp.py: support for frozen forms.
* Added string.find() which is like index but returns -1 if not found

cdplayer.py: It is now also possible to give the CD's TOC as argument
to init().  The TOC is a string consisting of 2 digits giving the
number of tracks and then for each track the length of the track as
number of minutes and number of seconds (2 digits each).

cddb.py: Interface to the .cddb directory.  Usage is the same as for
cdplayer.py.