TinyMCE Improvements: Open links from note window with popup and auto-create links
Note link tweaks

- Send modifier keys through to loadURI() when clicking Open Link in notes
- Open link in parent window from external note window
- Don't show both menus on right-click

Follow-up from #450
Merge pull request #450 from jlegewie/4.0 (+ tweaks)

TinyMCE Improvements: Open links from note window with popup and auto-create links