New Issue: Add int overload for 'bigint.cmpabs'

17718, "lydia-duncan", "Add int overload for 'bigint.cmpabs'", "2021-05-13T16:03:05Z"

The BigInteger method bigint.cmpabs() doesn't have an int overload, but does have one for bigint, real and uint. Seems like we could pretty easily make a bigint out of the int and call the bigint version (or call our own absolute value function to convert the int to a uint, or any number of alternates, really). We have a lot of int versions for functions that don't have an int equivalent in GMP that follow the pattern of converting to a bigint and sending it to the bigint method so I'm not sure why this isn't one.