post upgrade, relative URL support broken

[dan]

Confirmed. I redirected port 80 to 443 with nginx and can now use the toggles.

Two remaining anomalies:
1. toggling a station on in manual mode toggles off the others. I can't turn on two at once in manual mode.
2. run once > run now redirects to absolute URL /cr , so I will still have to track that down somewhere.

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I fixed #2 in runonce.html

I'm not certain that #1 worked differently in the previous version, and it's not very important, so am calling this good enough and officially moving to v4.

Having only one station on in manual mode is a feature that was requested by another user.