Removed 'x' file attribute.
Compensated for a systematic error in proj4s.

When transforming from EPGS:3397 to WGS84 and compare the results to Quantum
GIS, proj4s' geomtry is 60m north of QGIS. Both don't really line up with the
Google Maps aerials, so this is another story. I redefined EPGS:3397 to get
these two right as a start.
Hard-coded Google Maps aerial offset into maps.html.

This makes most sense, because there is probably another or no offset if I
switch to OpenStreetMaps. Since geometry is fetched in the list command, the
offset was placed there. Application of the offset, however, takes place in
_list/bbox-filter since it can take advantge of /view/lib/utils and I don't
have to write everything twice.
Moved _list/bbox-filter parameters to query.

If the list of keys is huge, JSON.parse(req.body) takes way more time than it
should: it also needs to parse req.body.keys, and I don't actually use this
array. Already with 300 or so items, the request speeds up by 25ms.
Moved all except keys from request body to URL-encoded data.
Query strings need to be parsed.
Removed useless 'items' collection.
Moved query params into an 'options' object.

I do not like this at all because as soon as I want to debug _list/bbox-filter
with curl, I have to deal with horrible URI encoding. Since CouchDB complains
even if I used 'count' instead of 'limit' (because it used to be count or
something), I have to nest all parameters. I don't know how else to name it!!!
Changed a few targets to _blank where it makes sense.