Disable send-to-Excel with equations for IPH models

[cpaulgilman]

Send-to-Excel with Equations requires modifcation of cashflow.lk and associated Excel workbooks that we will get to later as resources are available.

Type of change

Please delete options that are not relevant.

• 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 not work as expected)
• This change requires a documentation update
• This change modifies variables in existing compute modules. Please see Checking for PySAM Incompatible API Changes.
• This change requires updating the PySAM files via export_config. Please see When do the PySAM files need to be regenerated?

Checklist:

If you have added a new compute module in a SSC pull request related to this one, be sure to check the Process Requirements.

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[taylorbrown75]

Works as intended. All IPH models warn users Send to Excel with Equations is not available. Not sure why the tests are failing.

[janinefreeman]

Works great for all IPH configs! Thanks Paul!