CairoCanvas: fix margins from Julio Jiménez Borreguero

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40646 4005530d-fff6-0310-9dd1-cebe43e6787f
LazReport, lr_codereport, removed dups and change 0 constants to 0.0, from Julio Jiménez Borreguero

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40647 4005530d-fff6-0310-9dd1-cebe43e6787f