floatsAlmEq (are floats almost equal)

# Floating point math fun!  Since equality tests on floats are a crap shoot,
# instead check if floats are almost equal (is the first float within a
# certain tolerance amount of the second).
# Note, this function may fail in certain circumstances depending on the
# number of significant figures. If comparisons become problematic, you can
# try a different power of ten for the "tol" value (eg 0.01 or 0.00001)
def floatsAlmEq(f1,f2):
    tol = 0.0001
    return f1 > (f2 - tol) and f1 < (f2 + tol)