sync with errors/Makefile.
Reported by K Sathyasudha <ksathyasudha@novell.com>.
Testcases for type-resolution.
* test-300.cs: Add tests for local declarations and 'foreach'.
* test-301.cs: New testcase: several 'unsafe' related keywords.
* test-302.cs: New testcase: 'catch' clause parameters.
* test-303.cs: New testcase: 'using' keyword.
* test-304.cs, test-305.cs, test-306.cs, test-307.cs: New.
Variants that use namespace aliases.
* Makefile (NEW_TEST_SOURCES_common): Add new testcases.
svn path=/trunk/mcs/; revision=34774
