Reverted addition of parameters that are not used.

This is for #196.
Added missing unit tests.

This is for #196.
Reformated text.
Reformated text.
Revised code and documentation for #196.

Removed parameter B0 and B1 as they are no longer used.
Updated release notes.

This is for #196.
Added reference results for new unit test.

This is for #196.
Improved error message and changed order of function arguments to a more logical sequence.

This is for #196.
Replace variable aha with xC to use a consistent notation across the whole package.

This is for #196.