Fix decoding content-parameter header params
[mms] Better error handling when IMAP connection is prematurely disconnected.

Fixes the 'stdClass::getTimer' error I was never able to reproduce
before
Fix highlighting of quick search data when using all or recipient search
Fix regression in highlighting quicksearch results

escapeHTML() is needed, since the data to search is necessarily already
HTML encoded (or else it would be impossible to add the SPAN tags).

This broke searches for things like, for example, '<foo>'.
This is PHP, not JSON
phpdoc
Fix regression in returning null if no Disposition-Notification-To address exists
Correctly handle Original-Recipient value
parse() requires string input
ListHeaders fixes
Improved ListHeaders testing