Add sqrt; fix domains in function testsuite; update freeze of sp.Pow

Closes #123 (closed)

• Add the sqrt function to the IR, as well as to CPU, CUDA, SYCL, and x86-vector targets
• Rewrite case for sp.Power in freeze to generate sqrt calls where appropriate
• Adapt function test suite: Test on values within the correct domain for all functions
• Untrack some testsuite output files
• Remove some deprecated imports from the testsuite

requested review from @he66coqe

assigned to @da15siwa

changed milestone to %Release 2.0

added 4 commits

• 805a4b26...25d7040d - 2 commits from branch v2.0-dev
• ecbbdf72 - use np.concatenate
• 051d02d8 - Merge branch 'v2.0-dev' into fhennig/sqrt

Compare with previous version

approved this merge request

mentioned in commit e759f768

merged