enhancement - support both powspctrm and fourierspctrm in freq2raw helper function for conversion


git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@8569 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0
automatically synchronized identical files to revision 8569

git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@8570 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0