1) Indirect property values were ignored, now they are used.
2) Write endParaRPr so that PowerPoint display them.
3) Automatic colors are written as white or black based on
   whether background is dark.

Change-Id: I255c16f35149b738be2daf2800b1c90389f2c7cf
Reviewed-on: https://gerrit.libreoffice.org/17472Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com>