Exclude RC tags from versioningit calculations

[backmari]

Short description of the changes:

Add configuration to exclude RC tags for versioningit distance calculations. Without this, dev version numbers are reset when a new RC tag is created.

This is related to the change to publish dev packages to Anaconda: #149.

Check list for the pull request

• I have read the [CONTRIBUTING]
• I have read the [CODE_OF_CONDUCT]
• I have added tests for my changes
• I have updated the documentation accordingly

Check list for the reviewer

• I have read the [CONTRIBUTING]
• I have verified the proposed changes
• best software practices
  • all internal functions have an underbar, as is python standard
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

Manual test for the reviewer

References