Issue 7036: Firebug bugs when updating the DOM every 29 ms or less
Issue 7036: FBTests
Fix setting values with .% syntax (related to issue 6842)
Allow .% syntax even without Script panel enabled (related to issue 6842)

Bugzilla bugs 933882 and 934799 are fixed on 27+, so GC pauses aren't a
problem any more, and we can allow ourselves to throw away ion code on
explicit user action (it will regenerate quickly enough anyway).
Merge branch 'master' into jsd2

Conflicts:
	extension/content/firebug/debugger/debuggerLib.js
	extension/content/firebug/dom/domMemberProvider.js