[Cython] By default, use same interpreter for mechanism conversions

Fixes failures when only the Python 3 module is present.

git-svn-id: https://cantera.googlecode.com/svn/cantera/trunk@2668 02a645c2-efd0-11dd-984d-ab748d24aa7e
Fix some issues identified by compiler warnings

git-svn-id: https://cantera.googlecode.com/svn/cantera/trunk@2669 02a645c2-efd0-11dd-984d-ab748d24aa7e
[SCons] Add Boost libraries when building the shared library

git-svn-id: https://cantera.googlecode.com/svn/cantera/trunk@2670 02a645c2-efd0-11dd-984d-ab748d24aa7e
[SCons] Install Python 3 module to stage directory

git-svn-id: https://cantera.googlecode.com/svn/cantera/trunk@2671 02a645c2-efd0-11dd-984d-ab748d24aa7e
[SCons] Include Python unit tests individually in test result summary

git-svn-id: https://cantera.googlecode.com/svn/cantera/trunk@2672 02a645c2-efd0-11dd-984d-ab748d24aa7e