bugfix - do not remove elec and grad from comp structure, see https://sccn.ucsd.edu/bugzilla/show_bug.cgi?id=1617


git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@9592 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0
automatically synchronized identical files to revision 9592

git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@9593 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0