[Libreoffice] [patch] Bug 37889 - Adapt smoothing with splines to ODF1.2

Hi all,

In ODF 1.2 [1] smoothing with splines is concretized. The spec now 
contains a detailed description, how this splines have to be calculated.

[1] http://docs.oasis-open.org/office/v1.2/OpenDocument-v1.2-part1.odt

The patches attached to bug 37889 implement this algorithms. The patches 
are against LO3.4.0.2

This changes are large. The solution is tested on WinXp, but need 
exhaustive testing on other platforms, especially 64bit versions.

If you agree to the changes, than the help and the UI has to be adapted too.

Both smoothing methods are parametric, they treat the curves as 2D 
curves and not as function graphs. It might be an expedient task to 
specify and implement a way to smooth function graphs with retaining the 
function property to have only one y-value to an x-value.

Kind regards
Regina