Fixed #21634 -- Prevented hiding ImproperlyConfigured when command not found

Thanks nikolay.v.golub@gmail.com for the report.
cater for running tests from another directory than tests - applying existing pattern to newly added test_testcase_ordering as well
Remove old compatibility shims from d.c.gis.
Merge pull request #2657 from nschlemm/20140516-test_testcase_ordering

cater for running tests from another directory than tests
Fixed #22628 -- Took initial forms into account when combining FormSet.min_num and FormSet.extra.

Forwardport of 79f15ab1ef from stable/1.7.x
Fixed #22579 -- Corrected validation for email to reject trailing slash

Thanks to Claude Paroz for the report and patch and Tomasz
Paczkowski for the review.