[SCons] Print config.log when SCons is in verbose mode

git-svn-id: https://cantera.googlecode.com/svn/cantera/trunk@2927 02a645c2-efd0-11dd-984d-ab748d24aa7e
Use configuration checks to determine names for 'isnan' and 'finite'

git-svn-id: https://cantera.googlecode.com/svn/cantera/trunk@2928 02a645c2-efd0-11dd-984d-ab748d24aa7e