Note quirk in DMC emulation
.gitignore the executable..
Fix mac build, fix some warnings. Still a mess.

I notice the colors are still all messed up on the mac build. I
thought I fixed that. Also relies inexplicably on having discrete
graphics enabled for decent speed, despite being entirely framebuffer
based. Sigh.
Merge branch 'master' of github.com:ahefner/tenes

Conflicts:
	.gitignore
	filters.c