added details of new IMAP4_stream class; emphasised meaning of data part of command results; added proxyauth command description

support, based on my fetchmail experience.

SourceForge doesn't choke on this batch :-)

I'm not entirely sure this is 100% correct. The patch changes an
\index{persistency} to \index{presistence}, and I don't know what \index{}
does. But it seems to do so persi--er, consistently, so I hope it isn't a
problem.

I've added an extra comment about quoting arguments to
IMAP4 commands. Also changed the command descriptions
to show optional extra commands where appropriate.

Fred Drake:
Added example usage for the search() method based on comments from
<Lucas.DeJonge@awtpl.com.au>; elaborated error handling information
when arguments are missing from search() and uid().

(Very rough.)

Use the lowercase versions of the method names in the example, since
that's what's documented (Greg Stein's suggestion).  Add a blank line
after the import line for clarity.

Make some module references hyperlinks.

Fix up a few synopses.

reported to me by Piers Lauder <piers@cs.su.oz.au>.

An index entry.

Piers Lauders.