The purpose of this modification is to ensure that every normal request

The purpose of this modification is to ensure that every normal request
execution starts and ends in wiki.phtml, giving the code a somewhat
more predictable flow.

OutputPage.php:
* Added disable() method to Output class.
* Replaced exit() call in checkLastModified() with "return true" (thereby
  altering its contract quite severly).
* reportTime() now only returns elapsed time, code with side effects
  moved to logProfilingData() in GlobalFunctions.php.

GlobalFunctions.php:
* Added function logProfilingData() which does most of what
  OutputPage->reportTime() used to do.

Article.php:
* Replaced exit() in checkLastModified() with "return true" (thereby altering
  its contract quite severly).
* replaced implicit exit in calls to checkLastModified() and tryFileCache()
  with returns.

LogPage.php:
* replaced implicit exit() with return in call to checkLastModified()

SpecialRecentchanges.php:
* replaced implicit exit() with return in call to checkLastModified()

wiki.phtml:
* Single call to logProfilingData() at the end of the request.