Add a dummy env target to easily print environment
Remove -fno-color-diagnostics on clang

The latest p9p works around the color issue
Use wildcard to find cmds and libs instead of manually listing them

Side effect: remove the vestigial makefiles from those two dirs
Delete unmaintained test files
Rename modules' Makefiles to Make.me, since they aren't real makefiles
Trash "build", make make work automatically
Update README with make stuff
Add a generic prerequisite target
Add a getprereqs.sh for OSX
Remove that -o; everybody knows what's going on
Fix obj-c recipe