Experimental  addTestFileOnce($test_file) added, it includes PHP files using 'include_once' instead of 'include'(as it's done in addTestFile).
Experimental  addTestFileOnce($test_file) added, it includes PHP files using 'include_once' instead of 'include'(as it's done in addTestFile).

_requireWithError(..) now has the second optional argument $include_once(false by default) which specifies whether to use 'include' or 'include_once'


git-svn-id: 27d97511b394a53da462be9c10b1ad3995e26828@1481 9ad96551-d73f-0410-9433-afe301b4b3ac

GerHobbelt/simpletest,GerHobbelt/simpletest,GerHobbelt/simpletest