Various code health chores

[rhansen]

No behavior changes, just cleanups.

[buchdag]

LGTM except for that last commit, I don't want to spark an endless debate but I find two space tabs make code harder to read, especially on GitHub.

[rhansen]

LGTM except for that last commit, I don't want to spark an endless debate but I find two space tabs make code harder to read, especially on GitHub.

OK, I'll do 4 spaces. Or would you prefer something else?

[rhansen]

OK, I'll do 4 spaces.

Done.

I also pushed some new commits:

• Re-wrap long template comments to keep those lines under 80 columns long. (Unfortunately golang templates do not support line continuations inside {{...}} except for comments.)
• Move global variable values into a $globals dict to make it easier for future commits to pass the values to templates.