partial implementation of Pavel S. comments

git-svn-id: https://svnsrv.desy.de/basic/h1fitter/trunk@1509 b2a8d302-ca0a-427a-b7b9-081adbce06bc
remaining comments from Sergey A added

git-svn-id: https://svnsrv.desy.de/basic/h1fitter/trunk@1510 b2a8d302-ca0a-427a-b7b9-081adbce06bc