Migrate schematron implementation to built-in

[grechaw]

When built-in schematron validation is available, entity services can take advantage of it by placing a compiled version of entity services sch. schemas in the modules directory.
This could be checked in here to github or in svn directly

[grechaw]

Since 9.0-8 has reached functionally complete date, this mod should be queued up for work. It's a non-functional change but it would be good to knock it out with some chance to check out regressions

[grechaw]

I've done the initial foray into the switch. It seems like it's working. However the new implementation doesn't report the same failures are the previous one. I'd like to find out how to control the reporting in the new implementation. It might be that we can just modify the keys to be more precise and elicit the more granular error that we're looking for.

As an example of what im talking about -- an entity with missing info notes that there is no primary key -- which while strictly true is not the most relevant validation error for such a descriptor.