set random seed for 2 tests, package InvariantRing

one of the tests failed once
Merge branch 'master' of https://github.com/Macaulay2/M2
Merge branch 'master' of https://github.com/Macaulay2/M2
Merge branch 'master' of https://github.com/Macaulay2/M2
Merge branch 'master' of https://github.com/Macaulay2/M2
Merge branch 'master' of https://github.com/Macaulay2/M2