added check on the uncertainty covariance (or correlation) matrix if only one off-diagonal side is provided; automatically fills symmetric side in this case to get correctly filled ScaledErrorMatrix in GetChisquare.f

git-svn-id: https://svnsrv.desy.de/basic/h1fitter/trunk@1504 b2a8d302-ca0a-427a-b7b9-081adbce06bc
implemented comments from Pavel B

git-svn-id: https://svnsrv.desy.de/basic/h1fitter/trunk@1505 b2a8d302-ca0a-427a-b7b9-081adbce06bc
including comments from Hubert

git-svn-id: https://svnsrv.desy.de/basic/h1fitter/trunk@1506 b2a8d302-ca0a-427a-b7b9-081adbce06bc
partial inclusion of Andy's comments 

git-svn-id: https://svnsrv.desy.de/basic/h1fitter/trunk@1507 b2a8d302-ca0a-427a-b7b9-081adbce06bc