Fix a resource leak (and re-order a few calls)
Re-enable "In reply to" in the UI
Move xmlnode_get_child_data to its own file
Port JSON parsing logic from Home Timeline to DM
Standardize formatting
Fix reply retrieval.

Note that replies sent from PrplTwtr aren't threaded properly (there's
no in_reply_to being set); this used to work, so it should be a matter
of just finding the missing parameter (perhaps it changed between API
1.0 and API 1.1).