Backported a lot of changes from the oq-lite branch
Fixed the tests in the change-risk branch
Fixed a duplicated class name
Optimized assoc_assets_sites
Renamed OQLITEDEVPACKAGES -> OQLITEIMPORT
Fixed an info message
Optimized the implementation of assert_independent and removed spurious warnings
Restored assert_independend with subprocesses
Avoided mucking with sys.modules
Merge branch 'change-risk' of github.com:gem/oq-commonlib into change-risk
Addressed lots of points in https://github.com/gem/oq-commonlib/pull/52
Improved a comment
Merge pull request #52 from gem/change-risk

Basic support for risk calculators in commonlib