Problem Description :
XML Difference :
Original :
<a:solidFill>
  <a:srgbClr val="00B0F0"/>
</a:solidFill>

After Roundtrip : tag is missing

Solution : Added support for table cell border color.

Change-Id: I2baf969d7a8e46a0c5825d9f57bf135ec479c9eb
Reviewed-on: https://gerrit.libreoffice.org/15364Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>