* Start on some tests for <$action-deletefield />
* Only update modified field if we actually delete a field
…in the <$action-deletefield /> widget.
Fixes a bug where <$action-deletefield foo /> would update the modified field
if the "foo" field wasn't present on a tiddler.
* action-deletefield: Test when modified does and doesn't exist
* Add $timestamp argument to action-deletefield
To make it more consistent with other tiddler-manipulating action widgets
* Add docs for action-deletefield $timestamp
