Since report refactoring the function to override is get_report_values
that only returns a dict of value that are used in rendering.
In order to render a pdf with a landscape orientation, a context key could
be added however since it's not possible to return a report object in
get_report_values, it's difficult to add a contexti without using some tricks.
This commit add a report option to use in the template that will be used
in order to modify the pdf orientation. The process used was already existing
for other options like dpi,...
Arnold Moyaux
f384db9b67