Support for DMS notation

[danilort]

It is an excellent extension.

I suggest adding the support to the DMS notation (Degrees Minutes Seconds).
Sometimes I have to work with sexagesimal angles, for example sin(40° 11' 15"), but I can't do it directly.

I wrote a function:

dms(gg, mm, ss) = ((abs(gg deg) + abs(mm arcmin) + abs(ss arcsec)) * sign(gg))

so I can write:

It would be nice to be able to write:

x = sin(dms(40, 11, 15)) = 0.645291
asin(x) in dms           = 40° 11' 15"