fixed up dialog, backported some code from Pd-Vanilla 0.46

Move an ifdef with a GUI-messaging side-effect out of the way of an incrementally built gui message. (And possibly a good argument for why the gui_start_vmess interface might be a bad idea...)

fix some nasty regressions with drawnumber and drawsymbol due to Ivica and I overlooking fairly obvious compiler warnings :(

apply Matt Barber's patches for building on OSX: Changed LDFLAGS to point to pd-l2ork rather than pd

fix awful regression where deleting the end of a comment, a message, or the trailing arguments of an object didn't actually change the state of the object in Pd.

replacing literal "+" must come first

grabbed it from http://puredata.info/downloads/jmmmp/releases/0.46

remove one of the tutorial files that has a filename which causes problems under Windows (with the OS itself, outside of any of Pd's implementation details)

Cosmetic GUI changes: Reduce label font size in dialogs, enlarge prefs dialog window to fix bad line breaks in prefs dialog.