Added a forgotten file
Merge pull request #48 from gem/obsolete

Added a forgotten file
Fixed a subtle ImportError
Better management of the optional dependency from nrmllib, so that the doctests work
Merge pull request #49 from gem/obsolete

Fixed a subtle ImportError
Merge pull request #47 from gem/drop-risk-calculation

Converting the region_constraint into a WKT polygon in commonlib, not in the engine
Last updates for the commonlib course
Merged from master