changed names for type extension mechanism

Changed way C API was exported.

write.

then some.

We still need to take out some cStringIO oddities.

interfaces.

methods.

Added -t command-line option to generate title if:

   - The first paragraph is one line (i.e. a heading) and

   - All other paragraphs are indented.

Disabled autosave on Persistent.
Failed searches now raise a KeyError rather than returning an
empty ResultList.