Add a 'new journal here' button

The journal tiddler will be tagged with the name of the current
tiddler. This is similar to how the new here button works.

(Would have liked to reuse the journalButton code which is almost
identical between new-journal-here and new-journal, but I'm not
sure how to do it.)
pushTop should return resulting array
Improve new tiddler behaviour with existing tiddlers

Now repeatedly clicking “new journal” will reuse the existing journal
if one exists
Merge pull request #959 from simonbaird/new-journal-here

Add a 'new journal here' button
Add new-journal-here button to viewtoolbar ordering
Fixed truncation of tiddler info panel

Caused by the fix to #282
Fix for previous fix

Fix for problem introduced in 25f4ce93ac377400f3ee530fbc998b76f00cc899
Move new journal here button to the correct directory
Add link to Iannis Zannos hints site
Fix for titles including double quotes
Add new filter example
WIP: mptw5 hacking

Progress:
- Dumped the popup menu when you click a tag
- Shows a subtree of tagged tiddlers
- Added button captions by default and smaller buttons
- New here buttons enabled by default