Remove troublesome .cg[cp] files
Check for unsupported flags (old GCC)

Apple default GCC, even in Mavericks, fails to compile before this mod
because of unsupported -W flags.
Stop uselessly defining MAY_ALIAS

The definition of MAY_ALIAS in the Makefile was supposed to improve
compiler portability, but it just replaced it with a GNU Make dependency
which is a more realistic concern.
Whitespace and vim modeline
Mend SDL2 buffering bugs
Rename dword and fp mul so they don't conflict

Linking both of these objects into one executable would have been
annoying. Adopt a new naming convention.
Correct trapping of too-long immediates
Why did asmif.c have opts arrays ?
Catch too-long expressions reliably
Remove needless tree_destroy()
Mend whitespace error
Hoist common putnum() code
Permit newlines between .word data