Improved exception handling (message).

git-svn-id: http://svn.finmath.net/finmath%20lib/trunk@888 48fcbb9e-5639-0410-8b25-842128a4905d
Improved comments.

git-svn-id: http://svn.finmath.net/finmath%20lib/trunk@889 48fcbb9e-5639-0410-8b25-842128a4905d
Improved handling of the objective function giving NaN. Prior all iterations were used up, now it terminates after approximately 10 unsuccessful tries with different scales.

git-svn-id: http://svn.finmath.net/finmath%20lib/trunk@890 48fcbb9e-5639-0410-8b25-842128a4905d