cleaned up makefile, rm failing assembly
v0.2.5 final for Linux
Abort on nvidia, possible MSVC optimization
removed extra cuda comment
v0.2.5b
changed wrong number, fixed
Fixed broken Makefile

Makefile apparently lacked code to make versions of main.o since
version aeacbbc.  Restored enough to make at least the tpsieve_cls.
Restoration involves restoring the makefile lines and removing
appcu.h.