support multiple comments per file

Reviewers: pyblosxom-users,

Message:
hi all! this change added support for multiple comments in a single
file. it also added a script for "compacting" all comments for an entry
into a single file.

this improves performance for entries with large numbers of comments,
which otherwise have to glob, stat, and read a large number of comment
files during rendering.

i've uploaded it to http://codereview.appspot.com/ , which is a
lightweight, web-based code review tool. if anyone's interested in
reviewing it, please do!

(ignore the comments.js change; it's unrelated. it was supposed to go
in, but i didn't mean to check it in in this change.)

thanks in advance...

Description:
hi all! this change add support for multiple comments in a single file.
it also adds a script for "compacting" all comments for an entry into a
single file.

this improves performance for entries with large numbers of comments,
which otherwise have to glob, stat, and read a large number of comment
files during rendering.

(ignore the comments.js change; it's unrelated. it was supposed to go
in, but i didn't mean to check it in in this change.)

please review and provide feedback if you have any!

Please review this at http://codereview.appspot.com/25074

Affected files:
   M    comments.js
   M    comments.py
   A    compact_comments.sh

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