add chord symbol style options: full german, french, lower case bass, ...

... all caps note names

"Full german" was already implemented, selected by checking both German and lwoer case minor.  Now it's a separate button.  There is also a separate button for lower case bass note (previous tied to this same combination).  In addition, implemented a French option (same as solfeggio but with accent on "Ré") and an ":all caps note names" option (to get DO instead of Do in Solfeggio and French, and any other other multi-character note spellings we may add down the road).

Here's a screenshot of the dialog with these changes:

![international-chord-dialog](https://cloud.githubusercontent.com/assets/1799936/5372220/774a8154-8002-11e4-8af3-e4dc4566ad38.png)

There are tooltips to give examples of the main Standard / German / Full German / Solfeggio / French options.

Also fixes a bug with entry of "Sol" in Solfeggio mode - see http://musescore.org/en/node/41171