Setvar: Handle setting of existing fields to a value of the same type, even in collections
Squashed 'libs/libhtp/' changes from 371188f..8b63363

8b63363 Add htp_connp_get_connection().
cf40e92 Tidy up.
ae41621 Make htp_connp_in_reset() private.
5d35691 Tidy up.

git-subtree-dir: libs/libhtp
git-subtree-split: 8b633636531a3c430a17e07f81db7455631960f6
Merge commit 'ebd1ac680afa757cf5d7e3c81cace911fde3dbbd' into 0.7.x
docs: Document "event" action.