Comments and such in fixups.py.
Print the name of each fixup as it runs.
Add optional logging. It is time-consuming, so it happens only if a directory named _fixup_log exists in the working directory.
Treat w:drawing elements just like w:pict.
Support compat:AlternateContent (by always selecting the first Choice).
Fix Figure 1.
Code cleanup: apply_section_fixup -> map_section.
Simplify autogenerating links to tables.