added test for recently fixed crctx bug of duplicate commods
test for incorrect map iteration bug in ApplyThreshold
Merge pull request #814 from rwcarlsen/bugs-fix

add tests for bugs fixed in #811
Move files from integration_tests dir to tests dir.
Suppress cycpp pass 3 tests and rename another file to avoid nosetests.
check for NULL parent before calling agent's parent's DecomNotify
fixed next ids not being loaded properly. changed model destructor to not destruct children - causing segfaults due to improper unregistration for time and dre listening
Merge branch 'integration_testing' of https://github.com/rakhimov/cyclus into rakhimov-integration_testing