added linker dependencies for SWIG, made armadillo sources optional and (hopefully) fixed the fortran issue.
at runtime, a missing ZMUSIC symbol was reported (no surprise). There seems to be a file missing. Added a dummy file to create the symbol without changing the calling code. Now even the music test passes.
converted specest_gui. all algorithms seem to work although some unit tests still fail. armadillo is still not truly optional because of the SWIG integration. header and source already are omitted if no armadillo is present (only relevant for MUSIC).