Fixing to run under PHP 5.3:
* ereg() -> preg_match()
* split() -> preg_split()
* guarding array key lookups of non-existent keys with isset()
Still need to figure out why these parser functions that simply
return tags don't work:
* p4changes
* p4chgcats (each change listed)
* p4graph
* p4print (raw mode; text and wiki modes work fine)
* p4variants
Removed the following (deprecated?) parser extension tags:
* changelist
* recentchanges