Add dev-load page for term objects, to compliment dev-load-node, dev-load-user

I'm doing work with extending taxonomy terms for special cases - as an offshoot of the EOL taxonomy sprint.
Here's a patch that assists in analyzing the state of a term object. For most uses the result will be trivial (terms are not complex objects) but when used in conjunction with the term enhancers
- taxonomy_enhancer
- taxonomy_image
- term_relation_types
- taxidermy
- taxonomy_xml
- and the nascent taxonomy_term_load (for core D7)
this information is very useful.
In any case, it fits with the functions already provided by devel.module

It:
Adds a "Dev View" Local tab to both the
admin/content/taxonomy/edit/term/%
taxonomy/term/%
pages, dumping (as usual) an object representation.

Example showing the result of a term with taxonomy_enhancer, taxonomy_image adding term data

3 things.
- we do not yet have a menu loader wildcard for terms, but catch's taxonomy_term_load() will serve that purpose soon. So there's an extra callback function to emulate it.
- Only the above mentioned modules so far actually do (or will soon) use the hook_taxonomy_term_load() that I'm invoking - but it's transparent until then, so it's looking ahead.
- It required a small bit of oddness in making the MENU_LOCAL_TASK show up on a menu that wasn't a container before, but it holds together.

.dan.