Fix problem with tabs macro changing current tiddler

The problem was introduced in e18d8a88661a1c2caa1b722841747c75ca6af437
Fix tiddler widget to refresh properly

Previously wasn’t refreshing for changes to the tiddler that it refers
to
Add plugin.info to tw2parser

Every plugin must have a plugin.info file to be valid
Fix transclusion recursion detection

We were inadvertantly doing the recursion check before we were checking
if the transclusion target exists.
Extend checkbox widget to toggle fields
First pass at upgrade mechanism
Add instructions for the Google Analytics plugin
Fix typo affecting transclusion recursion detection
More defensive checks

We’ve had a few bugs with the symptom of ‘text’ being undefined.
Display plugin content in view template
Beginning of one-shot UI for upgrade.html
Docs update
Docs updates
Remove extraneous debugger statement
Improvements to one-shot upgrade UI
Missed off last commit
Correct copy/paste error
Upgrade wizard refinements
CSS fixes and improvements for upgrade wizard
Favicon for the upgrade wizard