More descriptive names are now used in order to make tracebacks
more readable.

change).  configure will be regenerated in the next commit.

changes).

Patch by Roger Serwy.

Patch by Roger Serwy.

to a single #define instead of having several copies in several files.

This excludes the Modules/ tree (datetime and expat both have a copy
for their own purposes with no need for it to be the same).