Moved warning stuff into MWDebug class.
- Group common code in one instead of doing checks one
time in GlobalFunctions.php and another time in Debug.php
- Remove the code catching the fact that a warning is due
to a deprecation warning, no longer needed
- Pass the caller offset from wfDeprecated() to
MWDebug::deprecated(); this was breaking deprecation
notices for global objects.
- Changed PHP error level for deprecation notices (when
$wgDevelopmentWarnings is set to true) from E_USER_NOTICE
to E_USER_DEPRECATED since we now require PHP 5.3+
- Added E_USER_DEPRECATED to wfSuppressWarnings() and
removed the check for the E_DEPRECATED constant being set
now that we require PHP 5.3+
- Fixed MWDebugTest by calling wfSuppressWarnings() and
wfRestoreWarnings() in setUp() and tearDown()
Change-Id: I6810b57c90d384de55a2cf177047767cdb734f79