AC_Autotune: Clean up Multi Variables and non functional changes

[lthall]

I have moved the multi only variable declaration variables into the AC_AutoTune_Multi.h.

I removed the "f" from the floats.

I simplified a couple functions.

All these changes should be non-functional.

I am a little disgusted by some of the structures that I made here. This still has some work to do before it could be considered "clean".