units: Don't include the test directory in the output tags file

Not having the test directory name in the expected output makes it
easier to move the test case, e.g. from a ".i" or ".b" directory
(broken tests) to a ".d" one (normal test) e.g. when fixing a parser
bug.
units: Strip directory name from all expected output
Merge branch 'units-basename' of https://github.com/b4n/fishman-ctags into b4n-units-basename

Conflicts:
	misc/units
Merge branch 'b4n-units-basename'