* Reimplement tools, starting with a spiffy AJAX expression tester. Didn't bother implementing as non-AJAX, as it's just an extra.
* Change exchange protocol between native parser and PHP app. Resulted in 2-3-fold performance boost.
* Fix minor bug from last night.
* Introduce a syntax check on-save.
* Introduce filter history (requires DB schema change).
* Deprecate now non-working /tools interface (will come back).
* Revert r38187 for now:
** Introduced a memory leak.
** Used an unnecessary library. The point is taken, and this will be fixed in a few days (using glibc instead).
* Fix logic error in boolean ops.
* Integrate with the PHP abuse filter using AbuseFilterParserNative class.
* Fix memory leak.
* Fix a few miscellaneous bugs