Remove viewsqlite.php and any SQLite leftovers

[stoyan]

Quick fixes:

• isset() was causing a 500
• looping over null $results was causing an error too

Long term question:

• Delete this completely?

[stoyan]

Turns out this is a leftover from an old system of labels.

There was one place that was still working: in the compare page there's an option to edit a label.

This label is written to /dat/labels.db

There are few problems with this:

• privacy: I changed a label of a test I didn't run. It persisted in incognito, so it's changed for everyone
• security: admittedly a low level but an alert() in the title executed the script while modifying the label. After a refresh it was escaped properly
• general confusion: the label is changed only on the compare page, the test otherwise shows the original label

Overall I love the idea of changing a label post-factum, but maybe a better implementation is in order

[pmeenan]

LGTM, thanks for the cleanup