* doc/libtool.texi (Libtool test suite): Mention the new

* doc/libtool.texi (Libtool test suite): Mention the new
testsuite.  Point to README rather than INSTALL for testing
instructions.
(Test descriptions): Fix more file names.  Also mention
cdemo-undef.test, mdemo2-conf.test, mdemo2-exec.test,
mdemo2-make.test, objectlist.test, pdemo-conf.test,
pdemo-exec.test, pdemo-inst.test, pdemo-make.test,
tagdemo-conf.test, tagdemo-exec.test, tagdemo-make.test,
tagdemo-static.test, tagdemo-shared.test, tagdemo-undef.test,
f77demo-conf.test, f77demo-exec.test, f77demo-make.test,
f77demo-static.test, f77demo-shared.test, fcdemo-conf.test,
fcdemo-exec.test, fcdemo-make.test, fcdemo-static.test,
fcdemo-shared.test.  Describe what they do.
(When tests fail, Troubleshooting): Mention how to pass options
to the new test suite.
* tests/tagdemo/README: Fix description.