Merge pull request #344 from ddobrev/master

Added the ability to only enable a given type map for a selected back-end
Fixed a bug when a char parameter is assigned a default value of 0.

Signed-off-by: Dimitar Dobrev <dpldobrev@yahoo.com>
Fixed the generation of constructor overloads synthetised because of default arguments.

Signed-off-by: Dimitar Dobrev <dpldobrev@yahoo.com>