Fix for PR automake/300:

Fix for PR automake/300:
* tests/pr300-lib.test, tests/pr300-ltlib.test,
tests/pr300-prog.test: New files.
* tests/Makefile.am (TESTS): Add them.
* automake.in (handle_ltlibraries): Strip nobase_ prefix to
compute	the directory.
* lib/am/header-vars.am (install_sh_PROGRAM): New variable.
* lib/am/libs.am (%DIR%LIBRARIES_INSTALL): New variable.
(install-%DIR%LIBRARIES): Use it.  Honor nobase_.
(uninstall-%DIR%LIBRARIES): Honor nobase_.
* lib/am/ltlibs.am (%DIR%LTLIBRARIES_INSTALL): New variable.
(install-%DIR%LTLIBRARIES): Use it.  Honor nobase_.
(uninstall-%DIR%LTLIBRARIES): Honor nobase_.
* lib/am/progs.am (%DIR%PROGRAMS_INSTALL): New variable.
(install-%DIR%PROGRAMS): Use it.  Honor nobase_.
(uninstall-%DIR%PROGRAMS): Honor nobase_.
See also the fix for nobase.test on 2001-11-09.