comments from Wojtek implemented

git-svn-id: https://svnsrv.desy.de/basic/h1fitter/trunk@1514 b2a8d302-ca0a-427a-b7b9-081adbce06bc
implemented Albertos comments

git-svn-id: https://svnsrv.desy.de/basic/h1fitter/trunk@1515 b2a8d302-ca0a-427a-b7b9-081adbce06bc
Implemented last comments from Pavel S

git-svn-id: https://svnsrv.desy.de/basic/h1fitter/trunk@1516 b2a8d302-ca0a-427a-b7b9-081adbce06bc
check on the filling of the uncertainty matrix off-diagonal sides moved after the reading of correlation files (check will also apply now to table-format matrices)

git-svn-id: https://svnsrv.desy.de/basic/h1fitter/trunk@1517 b2a8d302-ca0a-427a-b7b9-081adbce06bc
Fix mixed chi2 treatment: Hessian method should work for data with covariance matrix for stat and part of syst. error sources

git-svn-id: https://svnsrv.desy.de/basic/h1fitter/trunk@1518 b2a8d302-ca0a-427a-b7b9-081adbce06bc