Explicitly handle rounding on FP-to-integer conversions.

Explicitly handle rounding on FP-to-integer conversions.
Seems to avoid the significant problems on platforms w/o fenv.h.

arch/alpha/isa_desc:
    Explicitly handle rounding on FP-to-integer conversions.
    Seems to avoid the significant problems on platforms w/o fenv.h.
    Get rid of FP "Fast" vs "General" distinction... more headache than
    it's worth.
arch/isa_parser.py:
    Fix bug with "%s" in C++ templates (must escape properly to
    pass through Python string interpolation).

--HG--
extra : convert_revision : de964d764e67e0934ac0ef535f53c974640731fb