General:
- document.create*
- escape HTML entities (JS entities?) coming into the text functions

Style:
- add a CSS-parsing input API, or extract CSS->JS conversion from 
libstyle
- DOM_StyleIsDirty/DOM_LockStyle/DOM_UnlockStyle to allow global
caching of style data during document layout without racing with
alterations from mocha thread.

Layout:
- make proper LO_Elements for table stuff (pollmann)
- stick the DOM_StyleGetElementProperty stuff in all the right places
(reflow?)
- make <HR> honour inherited style (colour, etc.)
- lo_SetStyleSheetLayerProperties and need-to-pop-layer

libmocha:
- move destruction into LM_ReleaseDocument
- add destruction of style db
- look closely at the implicit pop stuff in DOM_HTMLPushNode
- wire up node reordering

XML:
- everything, really