Modified the fatal error message in the compilation, such that it is
easy to understand how to resolve the issue with a wrong WAVES_DIR
environmental variable.



git-svn-id: svn://svn.code.sf.net/p/openfoam-extend/svn/trunk/Breeder_1.6/other/waves2Foam@2024 e4e07f05-0c2f-0410-a05a-b8ba57e0c909