- IMP::atom::Hierarchy has been modified to get rid of the IMP::atom::Hierarchy::Type. Instead, all types are contained in the decorators. IMP::atom::get_by_type() was also updated to reflect this.<br><br>- IMP_check() and IMP_assert() have been<br>
replaced with IMP_USAGE_CHECK() and IMP_INTERNAL_CHECK()<br>respectively. Hopefully this makes it clearer when to use<br>which. IMP::set_check_level() has been revised accordingly (to use<br>IMP::USAGE and IMP::USAGE_AND_INTERNAL). Also, IMP_failure() and<br>
IMP_not_implemented() have been renamed to IMP_FAILURE() and<br>IMP_NOT_IMPLEMENTED() to make all macros be all caps. To update<br>external code,<br>      - replace IMP.EXPENSIVE with IMP.USAGE_AND_INTERNAL<br>      - replace IMP.CHEAP with IMP.USAGE<br>
      - replace IMP_assert and IMP_check as above.<br><br>- A \ref differences &quot;page&quot; has been added on the differences between the python and C++ interfaces of \imp. Please add salient points as they come up or let Daniel know about them so he can add them. The page is located at kernel/doc/python_differences.dox.<br>