[FIX,INTERNAL] Fixing problems in `mason.h`.
[FIX,INTERNAL] Fixing problems in `mason.h`.

 * Removing `\0` characters at end of file.
 * Using `SEQAN_OMP_PRAGMA` instead of plain `#pragma omp` so the compilers do not complain if OpenMP is disabled.


git-svn-id: a7f2a8f7432d210e972fb03898013d213e2b549b@11932 e6417c60-b987-48fd-844e-b20f0fcc1017

gkno/seqan,gkno/seqan,gkno/seqan,gkno/seqan,gkno/seqan,gkno/seqan,gkno/seqan