Simplify and speed-up quote() function.

Added _handlerList to allow shutdown to flush and close handlers in reverse order of creation (see SF# 1282539)

exec statements; people coming from certain other languages seem to be
confused by this on a regular basis

- fix several consistency nits relating to \method{...()}

It *appears* a flag is necessary instead.
This was tested in gdb 6.0.

Backport candidate

- Unify function description mode ("Return X" vs "Returns X")

from the input stream, so that the output is a byte string in the correct
encoding instead of a unicode string.

without thought. Anyway, such malformed HTML is better handled by something
like BeautifulSoup.

subclasses should be substituted as-is and not have tp_str called on
them.

about illegal code points. The codec now supports PEP 293 style error handlers.
(This is a variant of the Nik Haldimann's patch that detects truncated data)