Fixups and tests for cscope functionality. It seems cscope is not able to take into account relative file names of included cscope.files files, but it is able to canonicalize file names containing '../' sequences. This patch makes the cscope references relative again, and fixes some corner cases. * .gitignore: Ignore files generated by `make cscope'. * NEWS: Reword a bit. * THANKS: Update. * automake.in (handle_tags): Use $(am__cd). Provide default empty rule for the `cscope' target, for empty sources. * lib/am/tags.am (cscopelist): Construct relative path to files in $(srcdir) if $(srcdir) is relative. [TOPDIR_P] (cscope): Do not depend on cscope-clean. Only invoke $(CSCOPE) if cscope.files is nonemtpy. (clean-cscope): Rename from ... (cscopeclean): ... this. (cscope.files): Depend on clean-cscope. (distclean-tags) [!TOPDIR_P]: No need to remove cscope files here. * tests/cscope.test, tests/cscope2.test, tests/cscope3.test: New tests. * tests/Makefile.am: Adjust. Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>