added mark/unmarked navigation (keybindings.js + marks.js) and unmarked gid caching to marked.js (not sure if it is needed)...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
fixed a bug in buildcache -- now it both loads the latest version of images AND merges diffs...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
now both the viewer (loadLatestFile(..)) and buildcache (loaddiffs(..)) will not load diffs older than the latest base file...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>