* Remove ieee754_rem_pio2 in favor of a rem_pio2_kernel written in Julia.

* Add missing begin key.

* Remove _approx.

* Move to separate files.

* Fix LICENSE.md to mention FDLIBM instead of Openlibm.

* Address comments.

* Strengthen test to faithfully rounded.

* Fix LICENSE.md message for rem_pio2.

* Fix style in LICENSE.md entry.

* Remove semicolons.

* Move highword up, and remove duplicate unsafe_trunc.

* Fix LICENSE.md by removing a bullet and changing license of base/special/exp.jl.

* Change license info for base/special/exp.jl.

* Small changes.

* Get and reset precision for BigFloats, and space before rem in -rem.

* setprecision do

* Add comments, move test, and switch to muladd in some places.

* Fix y1 branches of rem2pi.

* Small changes.

* Move comment in rem_pio2.jl and add test for fast branch of mod2pi.

* rint docstring fix and make it clear what the constant is.

* Update comment for INV2PI.

* Fix wrong test set name.

* Tests against ieee754_rem_pio2 output.

* Inline cody_waite functions.

* rint -> round, remove rint, remove one argument cody waite, replace Int(x) with trunc(Int, x).

* Add some tests.

* Inline rem_pio2_kernel, and rearrange code slightly.

* fix xhp

* Use DoubleFloat64.

* Move constants into functions.

* Fix escaping of mod

* Fix tests and remove specific variables.

* Fix tests

* Fix issues raised in comments.

* More appropriate ulp test (test against eps of reference number).

* Change link to a stable github link.