saimn/sigal

GPS location code-block was incorrect, now working

I found that the code was wrong (outdated?). It used
'media.exif.long' when the correct is 'media.exif.gps.lon'.
It was also a bit unuseful since it showed it on the most zoomed
out map (continent level) and no marker.
The current link will go to a faily zoomed in (map=18) and put
a marker in the map.

Reorganize templates

Quote special characters in urls

…ates

Reorganise galleria templates

…mplates

Split landing page and album templates

Albums containing subalbums and image will display a warning and only
 display the subalbums
Rename landing.html template to album_list.html
Stop using abstract base class
Use class attribute instead of @Property

Album page templates have a single include for the landing page
template, so rendered pages remain unchanged.