Directional check on wave directions in wave theories. 3Dwaves tutorial corrected accordingly

git-svn-id: https://svn.code.sf.net/p/openfoam-extend/svn/trunk/Breeder_1.6/other/waves2Foam@2055 e4e07f05-0c2f-0410-a05a-b8ba57e0c909
Merge remote-tracking branch 'git-svn'