control-4.1.3

Most important changes:

• tf: Improve accuracy of transfer function from state space models
  by reusing an own version of the SLICOT function TB01ZD, which was
  removed in release 4.0.0
• connect: Added examples in the help text
• hinfsyn: check for more assumptions before calling SLICOT routine
• sgrid: fixed resizing (issue #15) and improved zeta-values for automatic selected lines of constant damping (bug #60972)
• build system: removed tests for old is_numeric (and similar) symbols (issues #18 and #21).

Please note: The source archives Source code (zip) and Source code (tar.gz) are automatically added to the release's assets by Github and do not contain the complete sources since this project uses submodules for the SLICOT library. All sources that are required for installing the control package in GNU Octave are included in the downloadable archive file control-x.y.z.tar.gz. The complete sources (including, e.g., the ones for packaging) are available in the repository which has to be cloned using the option --recurse-submodules.