Fabs() to fabsf() cleanup

[magicrub]

Lots of fabs() that should be fabsf() that needed changing.

• one fabs() call in plane that should have been abs()
• removed some fabs() calls that were then casting to a float, how silly is that!
• in Location there is lots of fabs() for doubles that are correct, those were left alone.

[tridge]

applied, thanks!