v0.44.2

AbstractAlgebra v0.44.2

Diff since v0.44.1

Merged pull requests:

• Is_unit and is_nilpotent (with tests) (#1933) (@JohnAAbbott)
• Fix show method for MatSpace (#1934) (@fingolfin)
• Re-enable conformance test for residue ring over Z[x] (#1938) (@fingolfin)
• Make is_exact_type and is_domain_type more convenient (#1942) (@fingolfin)
• Version 0.44.2 (#1945) (@fingolfin)

Closed issues:

• isunit for univariate and multivariate polynomials is incorrect over Z/nZ (#11)
• provide interface-conformance testsets (#312)
• Distinguish inexact rings (#860)
• Question about conformance test performing isone(inv(one(R))) (#994)