Grid fixes and improvements.

[badnames]

Basics

• I added a line to changelog.md
• The PR is rebased with current master.
• Details of what you changed are in commit messages.
• References to issues, e.g. close #X, are in the commit messages and changelog.
• The buildserver is happy.

Checklist

• I have installed and I am using pre-commit hooks
• I fully described what my PR does in the documentation
• I fixed all affected documentation
• I fixed the introduction tour
• I wrote migrations in a way that they are compatible with already present data
• I fixed all affected decisions
• I added automated tests or a manual test protocol
• I added code comments, logging, and assertions as appropriate
• I translated all strings visible to the user
• I mentioned every code or binary not directly written or done by me in reuse syntax
• I created left-over issues for things that are still to be done
• Code is conforming to our Architecture
• Code is conforming to our Guidelines
• Code is consistent to our Design Decisions
• Exceptions to any guidelines are documented

Review

• I've tested the code
• I've read through the whole code
• I've read through the whole documentation
• I've checked conformity to guidelines

[badnames]

I have added lines at y=0 and x=0 to indicate where the origin is on the map.
@markus2330 can you please take a look at the usecase and tell me if there is still something missing?

[yvonnemarkl]

jenkins build please

[badnames]

jenkins build please

[andreicristian97]

Looking at the code seems good, did not test it locally.
Noted one small typo in doc.

[andreicristian97]

Typo, in "on and of", should be "off"