Tons of formatting changes by Jon Tai.

Tons of formatting changes by Jon Tai.
Didn't merge changes to imap_search.php, as I wanted to take a
closer look at it.

Jon Tai said:
I cleaned up the four imap_*.php files - fixed comments so they use the
/* */ style, fixed spacings, added { } around logic blocks that didn't
have them, etc.

I also hacked sqimap_find_email() in imap_general.php to support strings
in the form of "lehresma@css.tayloru.edu (Luke Ehresman)".

git-svn-id: https://svn.code.sf.net/p/squirrelmail/code/trunk/squirrelmail@2591 7612ce4b-ef26-0410-bec9-ea0150e637f0