Improved update_geometry()'s performance.

I can not really be proud of me because this is how it should've been written
in the first place.
Removed bounds check in expand_options().

It is faster to just let ci=c[i] return undefined. I also top-hoisted ci, cij
and cijk because it shortens source lines considerably.
Replaced value attribute with $.text() for field columns.
Increased url and spatial response length limits.