Batch of possible 'performance' commits - mainly based on simplifying xdebug output

PHP5 triggers an 'strict' error when using adodb. e.g. use of var should be private/public.
As we require php4 support, ignore these messages in our current error handler, and return
from the error_handler quicker.

OLD:

Xdebug cumulative time for view_all_bug_page for 1 run: 12,264ms
Number of DB queries: 88
error_handler calls: 153 calls. Total Self: 51ms, Total Cum: 121ms

NEW:

Xdebug cumulative time for view_all_bug_page for 1 run: 12,264ms
Number of DB queries: 88
error_handler calls: 153 calls. Total Self: 8ms, Total Cum: 8.3ms

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@3876 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9