gnulib-tool.py: Implement options --without-c++-tests etc.
* gnulib-tool.py (main): Accept options --without-c++-tests,
--without-longrunning-tests, --without-privileged-tests,
--without-unportable-tests.
Improve error message for --copy-file with invalid number of arguments.
Check for invalid options given in --import, --add-import,
--remove-import, --update modes.
Pass both sets of test categories to the GLConfig constructor.
* pygnulib/GLConfig.py (GLConfig.__init__): Accept incl_test_categories
and excl_test_categories instead of testflags.
(checkInclTestCategory): Renamed from checkTestFlag.
(enableInclTestCategory): Renamed from enableTestFlag.
(disableInclTestCategory): Renamed from disableTestFlag.
(getInclTestCategories): Renamed from getTestFlags.
(setInclTestCategories): Renamed from setTestFlags.
(resetInclTestCategories): Renamed from resetTestFlags.
(setInclTestCategory, checkExclTestCategory, enableExclTestCategory,
disableExclTestCategory, getExclTestCategories, setExclTestCategories,
resetExclTestCategories): New methods.
* pygnulib/GLModuleSystem.py (GLModuleTable.__init__): Accept two
booleans as second and third constructor arguments.
(transitive_closure): Correct the determination of whether to include
each module, depending on the with-* and without-* options.
(transitive_closure_separately): Update.
* pygnulib/GLMakefileTable.py: Update.
* pygnulib/GLImport.py (__init__, actioncmd, gnulib_cache, execute):
Update.
* pygnulib/GLTestDir.py (GLTestDir.__init__, GLTestDir.execute,
GLMegaTestDir.__init__): Update.