Update .gitignore, requirements, and enhance indicators model with ne…

[Abhishekfm]

No description provided.

[jpmckinney]

@Deepthi-Chand You'll see I extracted India-specific logic in #66 so that IDS-DRR can be redeployed by other jurisdictions. I would propose to move in that direction. In support of that, I'll make changes to that branch and to the new configuration files, that correspond to the changes here. I also plan to record a short video and share on Slack to demo how deployment-specific configuration changes can be made.

Edit: My corresponding changes (specific commits referenced below this comment): 4d57de5...bff2eb4 I also added this branch's Assam CSV to the backend.zip attached to that PR.

[jpmckinney]

To help reduce conflicts, I've squashed your commits. You can still find your original history at fa47940

Otherwise, this still conflicts with #66 if this is merged first, but I already made the corresponding changes per my above message, so the solution to the conflicts will be to just let the reusable branch win, e.g.

git merge -X reusable feat/datasource-link

Or one file at a time:

git checkout --ours path/to/file
git add path/to/file

You can preview the conflicts with (from the reusable branch):

git merge --no-commit --no-ff feat/datasource-link

(Then git merge --abort after reviewing.)

Conflicts are essentially:

• Indicator CSV updated in this branch, but removed in reusable (file moved to https://github.com/open-contracting/ids-drr-india-plugin)
• import_data.py updated here, but this logic was refactored into layer/importers/indicators.py‎ in reusable
• help_text in models.py differs (reusable uses more generic language)
  • This conflict could be resolved ahead of time if you want. Just need to copy the change into this branch, amend the commit, then force-push.
• requirements.txt differs (reusable upgrades a few adjacent packages)