analyze_gfortran_ast.py: Add checks for WHERE, FORALL, and THREADPRIVATE

git-svn-id: svn://svn.code.sf.net/p/cp2k/code/trunk@14660 bac0169d-1eea-4375-b5f6-f89d2ced9994
some more conversion fixes


git-svn-id: svn://svn.code.sf.net/p/cp2k/code/trunk@14661 bac0169d-1eea-4375-b5f6-f89d2ced9994