Duplicate post Tags UI for other taxonomies

[tellyworth]

This duplicates the Tags postbox UI (with the Add button and X to remove) for all non-hierarchical post taxonomies.

No doubt js experts will find it crude in spots but it works. I've left in two register_taxonomy() calls that I used for testing, lines 209 and 210 of edit-form-advanced.php. They're useful for testing this patch but should obviously be removed for production.

There's no real code for fetching or saving taxonomies other than post_tag. That should probably be included but requires some careful fitting with get_tags_to_edit() and friends so I've left it out for now. I added a quick filter as a crude fetch hook but it should probably be replaced with something more solid.

[tellyworth]

save and fetch code added

[tellyworth]

The new patch has some better code for saving and fetching. Note that, while wp_insert_post() still supports the tags_input item for compatibility, the new UI code now passes in $_POSTtax_input? instead.

The temporary test taxonomies are still there but moved to the bottom of taxonomy.php.

[tellyworth]

fix conflicts and diff against 7521

[tellyworth]

fix css, l10n, autosave, enter keypress

[ryan]

Would love if the get and set of post terms dealt with IDs instead of names since we're in the code.

[tellyworth]

Updated patch applies to trunk

[tellyworth]

Same patch as before, but applies cleanly to r7641.

[tellyworth]

patch against r8339 plus improvements

[westi]

Feature freeze.. move to 2.8 for now.

[noel]

post taxonomies ui patched against r10210

[ryan]

Instead of passing a taxonomy arg to a tag function, we should just use the generic term function. That tag functions are convenience wrappers but if we're passing a taxonomy to them they are fairly pointless.

[ryan]

Not sure what the show_message() call is about. Seems it should be removed.

[ryan]

Lose show_message(). Fix notices. Use generic terms funcs instead of passing tax to tag funcs.

[ryan]

(In [10222]) Allow muliple tag-like taxonomies in the post editor. see #6387