[ansel] found why ansel dont stores images in subgallery

[duck]

Ben, today I had time to revisit the problem of storing  images in Ansel 
sub galleries.

it tries to save the in sub gallery in the way: ".horde/ansel/schedul:test"
of course the system wont let him do this
for OS compatibility issues you should translate the path
something like

function translate_path($path) {
    return str_replace(':', '/', $path);
}

to be called

$vfspath = sprintf('.horde/ansel/%s', 
Ansel_Gallery::translate_path($this->data['gallery']));