BugID: 835

Added AIPS++ compiler variant definition. This is needed since the new
lofar_aips++.m4 macro does not check for the AIPSPATH environment variable
anymore. Hence, we must now ALWAYS pass the --with-aipspp or --with-casacore
option to lofarconf/configure.

autoconf_share/variants.dop131

-gnu.compiler.conf:	CXX="$CCACHE /usr/bin/g++"
+gnu.compiler.conf:		CXX="$CCACHE /usr/bin/g++"
 
-lofar_root.var:		--with-lofar-default=weekly --with-doxygen-dot
+gnu.compiler.aipspp.var:	--with-aipspp=/aips++/weekly/dop131_gnu
+
+lofar_root.var:			--with-lofar-default=weekly --with-doxygen-dot