a select command invalid selection variable name is now a fatal error in posix mode; many test suite additions

tests/run-invocation

@@ -0,0 +1,2 @@
+${THIS_SH} ./invocation.tests 2>&1 | grep -v '^expect' > ${BASH_TSTOUT}
+diff ${BASH_TSTOUT} invocation.right && rm -f ${BASH_TSTOUT}