error: update download options on errors

editor: improve endpoint persistence with namespaced localStorage keys

Previously  new thor usage on the same domain would overwrite each other.

fix: inconsistent colors in favicons #22

fix bug causing maps with ?lat ?lon variables to fail

 Support setting a page title using a "title comment" like in WDQS-GUI …

…#10

 Fixes #10 and #9

Switch from AGPL to GPL