moved cwiid and all disis libs except disis_munger to externals/disis, and removed linux-specific build instructions from tar_em_up.sh

begin porting the disis_* dirs to a single library in externals/, starting with disis_phasor~.c.  We're just using the most recent version of pdlibbuilder to do the heavy lifting.

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