This Fixes a bug in guided query where submitter pulldown option did not work.

Any file named "user.log" uploaded for an event will be displayed in the event detail.
Neighbors in on the event detail page show more detail.

Time info includes event time and creation time
in both UTC and GPS time formats, plus reporting
latency.

There are two base templates here.  One with logos on top, one
with them in the footer.  Need to decide which to use befmore pushing live.

Guided query
    - results now display equivalent text query, if possible
    - results now include number of events listed
    - initially hidden, becomes visible on click
Some display fiddling
    - hints and current query link more visible, less ugly (imho)
    - stuff lines up better

cli_tag, non-functional form drop-down, show tags on event detail page.

Added a 404.html template.
gracedb/view raises Http404 when event is not found.
Event.getByGraceId should now never return None.

Changed display of all date/time data to be UTC.
GPS times display UTC times when cursor hovers over them.