Made the porosity runTime-selectable. Currently only one method available. Commit includes derived modifications.

git-svn-id: svn://svn.code.sf.net/p/openfoam-extend/svn/trunk/Breeder_1.6/other/waves2Foam@2056 e4e07f05-0c2f-0410-a05a-b8ba57e0c909
Resolving naming match between waves2Foam and 2+ OF-versions

git-svn-id: svn://svn.code.sf.net/p/openfoam-extend/svn/trunk/Breeder_1.6/other/waves2Foam@2057 e4e07f05-0c2f-0410-a05a-b8ba57e0c909