[Tilesathome] Striped rendering is back

[Patrick Kilian]

Hi,

> I have just commited my new implementation of the striped rendering to
> the _unstable client.  This is now optional and configurable.
Thanks for that commit, it unbreaks -unstable for me. Below are the
results from the speed tests I did so far. This is rendering an empty
tile (xy 123 456) on a Pentium Mobile with 1700 MHz in a box with 1.2 GB
Ram.

stable:
real    0m23.929s
user    0m15.533s
sys     0m0.688s

unstable: (RenderStripes = 0)
breaks after 1m50s

unstable: (RenderStripes = 1)
real    1m58.567s
user    1m37.322s
sys     0m12.201s

unstable: (RenderStripes = 4)
real    2m37.587s
user    2m2.480s
sys     0m23.581s

unstable: (RenderStripes = 5)
real    6m13.988s
user    4m32.269s
sys     1m20.893s


Patrick "Petschge" Kilian