Added more c*r macros.

Oddly, I find that I use one or two macros in this set on a fairly regular basis, and was hoping you wouldn't mind having them included :-)

Also, I was going to add some unit tests, but I couldn't actually figure out how to run the LFE ct suites... if you would like to push back on this pull request until I get those added, no problem! I just need some pointers on running CT under LFE first :-)