Expand search options when the search box is focused.

Fixes bug 2730.
Don't remember search fields if accessing from an arbitrary URL.

Fixes bug 2731.
Don't use img tags for sorttable icons.

Avoids strange artifacts in WebKit browsers:
http://stackoverflow.com/questions/5743083/strange-border-on-img-tag

Fixes bug 2268.
Check for the data attribute.
Comparison correctness.
Mind indentation.
Replaced search drop-down arrow with a proper search icon.

Fixes bug 2739.
Add LINGUIS file with 100% translated languages
Allow build_mo to use LINGUIS

Also added:
 --lang - to build a speficied language
 --all - to build all languages
Don't use -c - too much noise

Headers have too many errors that mask real errors
The JS files generate errors that aren't really errors
Typo
PEP8 fixes.
Don't use a sliding animation.
Added small shadow.
Rather use decorators for registering filters.
Reordered filters for improved code readability.
Removed style declaration.

Apparently doesn't have any effect (the divs are displayed inline).
Reduced z-index not to interfere with lightboxes.
Added convenience .hr class.
PEP8 fixes.