Support for php 5.5, 5.6.

Removed deprecated preg_replace with #e modifier,
force opcache refresh in cache files.
Removed the message, which doesn't exist in lang_misc.php.
Determine the post page number based on pid, not time.

This change is required for pun_move_posts to work correctly.
array_diff executed on arrays of arrays, which raises a notice.
Handling bbcode tags that won't be closed.
array_diff executed on arrays of arrays, which raises a notice.
Postgres, Strict standards: Resource ID#202 used as offset, casting to integer.
anonymouse function replaced by create_function to improve compability.
Merge pull request #108 from keeshii/v1.4next

Support for php 5.5, 5.6.