- fix htmlspecialchars handling in search (search backends get specialchared input...

- fix htmlspecialchars handling in search (search backends get specialchared input, and should return specialchared output), current backends strip entities anyway [includes Bug #8156]
- allow cancelling search index creation/removal
- custom CSS class name input too short [Bug #8328]
- give an error message if a password wasn't convertable (special characters in non-standard encoding)
- moved still_on_time to functions.php, used by acp_search and converter, might be useful for MODs (or complex cron scripts)
- do not allow empty passwords on login
- add sids to local URLs in posts (this was a really terrible bug to fix ;-)) [Bug #7892]
- ignore invalid HTTP_X_FORWARDED_FOR headers (just use REMOTE_ADDR if invalid) [Bug #8314]
- changed forum listing code on search page and acp_attachments [Bug #6658]
- search indexing uses still_on_time(), smaller batch size (1000) and meta_refresh() instead of redirect(), this should solve a few problems [Bugs #8034, #8270]
- made password requirement language strings clearer
- ALPHA is not meant to be alphanumric [Bug #7764]
- display bug in firefox on linux making the pagination wrap on search results page (caused by  )

git-svn-id: http://code.phpbb.com/svn/phpbb/trunk@7076 89ea8834-ac86-4346-8a33-228a782c2dd0