Support a full suite of DML as proc bodies

And treat unknown things as the start of a body too (with a warning)
Merge pull request #296 from iarna/support-non-block-bodies

Support a full suite of DML as proc bodies
Stop emitting the foreign key dance on data only changes

Unfortunately, we need to avoid the foreign key dance as much as possible as
it's very slow (full table copy) on MySQL 5.5.  As it's usually safe to do
so when only data rows are changing, we're doing that for the time being.
Merge pull request #297 from iarna/skip-foreign-key-dance

Stop emitting the foreign key dance on data only changes
Fix PEAR URL to match what Github has forced
Merge pull request #298 from aredridel/update-pear-URL

Fix PEAR URL to match what Github has forced