php 5.4 issues: htmlspecialchars, session_unregister

Hi. I was having some issues with squirrelmail-1.4.* (including stable 
SVN) after migrating to php 5.4:

1) function/i18n.php in function charset_decode have call to 
htmlspecialchars, which was using charset ISO-8859-1 as default and now 
it is UTF-8. Because of that it cuts all non-ASCII characters, for 
example, in message with KOI8-R charset. I replaced its call to:
htmlspecialchars($string, ENT_COMPAT | ENT_HTML401, 'ISO-8859-1')
This function seems to be changed in version 1.5, but 1.4 users are 
still unhappy.

2) plugins/message_details/message_details_bottom.php have call to 
function session_unregister, which was deprecated in php 5.3 and removed 
in 5.4


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