Fixess issues 995 and 2490

[fe-cj]

Fixes issues #995 and #2490. They are both related to the drawing of the top border horizontal line of a table.

• The problem with #995 was that the top horizontal line of the table was drawn before the beginUnbreakableBlock of the dontBreakRows property was executed, leaving the horizontal line orphan in case of a pabe break. This bug appeared when dontBreakRows is active, table has no headerRows, and first row of the table causes a page break.
• The problem with #2490 was that it was drawing the top border of a table with no headersRow and no dontBreakRows before knowing if the flag skipOrphanePadding will be activated. skipOrphanePadding causes not to draw any piece of a row in the current page. That is why the drawing of the table top border of the table when it has no headerRows and no dontBreakRows, has been moved to the method endRow, where we know if skipOrphanePadding will be activated or not.

[liborm85]

Merged. Thanks.