probably fix #3055
generic fallbacks for the 4 stooges itrunc, iceil, ifloor, iround (part of #3040)
FloatingPoint->Int128 conversion (existing code mostly works for BigFloat too)
more BigFloat to int conversions
fix a couple other BigFloat issues
Merge branch 'master' of github.com:JuliaLang/julia

Conflicts:
	base/mpfr.jl