xls-report.py: separated image width and height for easier analysis.
Merge pull request #1237 from SpecLad:xls-separate-wh
Like mentioned by Andrei Pavlenko after merging pullrequest #1206, a wrong
ReST directive was used. Also fixed some other ReST directives that were
not correct and removed some warnings during buildbot checks.
Merge pull request #1232 from StevenPuttemans:fix_wrong_documentation