Log Message:
Rename all PHP 4 packages to php4-*, all PHP 5 packages to php5-*,
all PEAR packages to php?-pear-* and all Apache packages to ap13-* or
ap2-* respectively. Add new variables to simplify the Makefile
handling. Add CONFLICTS on the old names. Reset revisions of bumped
packages. ap-php will now depend on the default Apache and PHP version.
All programs using it have an implicit option of the Apache version
as well.

OK from jlam@ and adrianp@.