Pull Request Template

Description

Change variable labels for LCOE, NPV, and IRR to use consistent style like "LCOE Levelized cost of energy nominal:"

• Abbreviation precedes full name for alphabetic sorting and to facilitate searches
• Full name is capitalized (first letter only)
• Descriptor like "nominal" is at end of label with no parentheses to avoid confusion with units displayed in parentheses
• Avoid non-alphanumeric characters in labels to minimize potential parsing problems when exporting to CSV and other formats on different operating systems

Fixes #648

Goes with NatLabRockies/ssc#770

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

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.

• [x ] My code follows the style guidelines of this project
• [x ] 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