gfm ~master (2020-03-08T16:04:01Z)

- abs
`FixedPoint!(M, N)`abs`(FixedPoint!(M, N) x)` abs() function for fixed-point numbers.

- FixedPointstruct FixedPoint(int M, int N)
M.N fixed point integer. Only signed integers are supported. Only supports basic arithmetic. If M + N > 32, then wide integers are used and this will likely be slow.