event integration cleanup, use plone.app.event master and use released dependencies otherwise
various fixes to upiq.cfg for plone 4.3 compatibility.  Includes:

(1) use plone.app.dexterity [grok] in eggs for backward compatbility with plone.directives.form shim.
(2) Remove uu.inviting and uu.subscribe in favor of collective.inviting and collective.subscribe
(3) Add Products.PloneHelpCenter to sources, as latest release is not yet Plone 4.3 compatible.
(4) Use newer plone.autoform -- for now use a new fork with fixes that have been pushed to plone.autoform master upstream; this can be retired later upon a subsequent future package release.