Added formatting protections and small adjustements for DrawPdfs
- protection against too high and two low log penalty partial terms in Results.txt
- adjusted labels size in chi2 scan plots
- adjusted x axis in pdf variations chi2 scan plot
- maximum 2 digits in log penalty chi2, when it is ~0



git-svn-id: https://svnsrv.desy.de/basic/h1fitter/trunk@1592 b2a8d302-ca0a-427a-b7b9-081adbce06bc