Ensure Translate/OutputSBML work on Octave and Matlab

[fbergmann]

Description

We need to do a couple of things here:

• cleanup use of global variables to sort leaking crash in octave
• cleanup m files (for example 0/0 will give a warning each time in octave, maybe better to use NaN)
• add a basic octave ci test for linux.

Motivation and Context

Currently the octave bindings are broken.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Change in documentation

Checklist:

• I have updated all documentation necessary.
• I have checked spelling in (new) comments.

Testing

• Testing is done automatically and codecov shows test coverage
• This cannot be tested automatically