- Fixed the rendering of the area of a table corresponding to border-separation,...

- Fixed the rendering of the area of a table corresponding to border-separation, which must be filled with the background of the table, and not the rows.
- Improved conformance: even if a table-cell spans several rows its background must correspond to the first row spanned.
- Added support for background on fo:table-column and fo:table-header/footer/body
  TODO more testcases needed, especially tables with collapsing border model and tables broken over pages

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@633961 13f79535-47bb-0310-9956-ffa450edef68