added checks for inf & nan for state vars

[MauriceHendrix]

Description

This adds code to the C++ output th check for state variables becoming NON or INF.
As an example see chaste_codegen/data/tests/chaste_reference_models/Normal/non_dynamic_aslanidi_Purkinje_model_2009.cpp
The crucial bit is:

    void Cellaslanidi_Purkinje_model_2009FromCellML::VerifyStateVariables()
    {
        std::vector<double>& rY = rGetStateVariables();
        
        
        for (unsigned i=0; i < 30; i++)
        {
            if(std::isnan(rY[i])){
                EXCEPTION(DumpState("State variable " + this->rGetStateVariableNames()[i] + " is not a number"));
            }
            if(std::isinf(rY[i])){
                EXCEPTION(DumpState("State variable " + this->rGetStateVariableNames()[i] + " has become INFINITE"));
            }
        }
    }

This section also still contains the previous checks where they are required.

Motivation and Context

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)

Documentation checklist

• I have updated all documentation in the code where necessary.
• I have checked spelling in all (new) comments and documentation.
• I have added a note to RELEASE.md if relevant (new feature, breaking change, or notable bug fix).
• [-] I have updated version & citation.txt & citation.cff version.

Testing

• Testing is done automatically and codecov shows test coverage
• This cannot be tested automatically
  I have re-run the Codegen test pack in with current develop branch of Chaste and thiscodegen branch. That test passes without issue.

[codecov]

Codecov Report

Merging #249 (689b65b) into master (3aa2b20) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #249    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           26        30     +4     
  Lines         1522      1780   +258     
==========================================
+ Hits          1522      1780   +258     

Impacted Files	Coverage Δ
chaste_codegen/__init__.py	100.00% <100.00%> (ø)
chaste_codegen/_chaste_printer.py	100.00% <100.00%> (ø)
chaste_codegen/_command_line_script.py	100.00% <100.00%> (ø)
chaste_codegen/_config.py	100.00% <100.00%> (ø)
chaste_codegen/_jacobian.py	100.00% <100.00%> (ø)
chaste_codegen/_labview_printer.py	100.00% <100.00%> (ø)
chaste_codegen/_linearity_check.py	100.00% <100.00%> (ø)
chaste_codegen/_lookup_tables.py	100.00% <100.00%> (ø)
chaste_codegen/_optimize.py	100.00% <100.00%> (ø)
chaste_codegen/_partial_eval.py	100.00% <100.00%> (ø)
... and 12 more

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[kwabenantim]

I would probably replace INFINATE with INFINITE but otherwise looks good to me!