Convert std.math.isFinite into a template
Convert std.math.isSubnormal into a template
Add floatTraits.SIGNPOS_BYTE for float
Convert std.math.signbit into a template
Convert std.math.copysign into a template
Fixup use of whitespace in places
Merge pull request #2305 from ibuclaw/tmplmath

Change various std.math.isXXX into templates