RevisionDeleter:

RevisionDeleter:
* Fixed comment of getChanges and made it public
* Removed getLogMessage and expandMessageArray, now unused
LogFormatter:
* Cache parsed parameters locally, since this function is going to be called few times for every log entry
DefaultSettings:
* Could not find any use of suppress/file log
LogPage:
* Removed old formatting code, now unused
WikiPage:
* Converted (suppress|delete)/delete logs to new format

Added DeleteLogFormatter, handles part of suppression log as well.
Updated messages.
This also addresses bug 18578.