Fix spacing above filter in filter_horizontal

--HG--
extra : rebase_source : c32f0664d73ce78075403244d0d9b137d47613ae
Fix different box heights in filter_horizontal boxes

The heights are adjusted using javascript in django, but the heights
end up mismatched in grappelli-safe. It turns out that setting the
heights in CSS is enough to make the heights match again.

--HG--
extra : rebase_source : 7fc37de449d20b32e2233143a09be8d4276fedca
RTL: fix filter direction in filter_horizontal

--HG--
extra : rebase_source : bfde0034ca535f6e08e7317a72612934d272b780
Version bump to 0.2.17