More features + fix Output regression
Fixes #34 (closed), #49, #58 (closed)
Adds App.elapsed_time, OTBObject.metadata, OTBObject.data, OTBObject.get_infos(), OTBObject.get_statistics() Fix Output inheritance, this object must provide all the OTBObject dunder methods.
Also should fix a max recursion depth when trying to access unknown OTBObject attribute
Edited by Cresson Remi