added method to compute number of shifts from accuracy and also added
a constructor to set this accuracy. Some minor refactoring otherwise
make unit test use newly added method to compute the number of shifts
Added accuracy based constructors to implementations of rational approximation base class
provide information in case of negative accuracy
using existing method to compute accuracy
added my name to copyright
remove constructor with num shifts and offer a method to set that instead
replace constructor call with num_shifts with dummy value for accuracy and set num shifts by hand
disable broken test temporarily
Merge pull request #1513 from karlnapf/develop

Automatic computation of number of shifts