bennerh

Results 4 issues of bennerh

When trying to add a subsystem consisting of exactly one node, an error occurs in shift_numbering.m [files_issue.zip](https://github.com/KIT-IAI/rapidPF/files/6727143/files_issue.zip)

Added a few tests but mostly documentation in extension_to_OPF.md and extension_to_OPF.html Still need to check and document consensus matrices, initial conditions and bounds.

Include MATPOWER hessian function for Lagrangian. This should be possible by setting the lambda and entries corresponding to the copy nodes to zero.

Dear @mkhraijah thanks a lot for providing this package! I read the corresponding paper and wanted to compare the results from table 1 on my machine to an algorithm that...