Temporary commit with num_utils, will move to common shortly.

git-svn-id: https://svnsrv.desy.de/basic/h1fitter/trunk@1537 b2a8d302-ca0a-427a-b7b9-081adbce06bc
Moving num_utils to common/

git-svn-id: https://svnsrv.desy.de/basic/h1fitter/trunk@1538 b2a8d302-ca0a-427a-b7b9-081adbce06bc