Start addressing the performance scaling problem in github issue #46.
Fix bug in format regex.  Slows first itteration reported in #46 by about 60%.
Update 'waf configure' code for new suite data structure.
Allow setdefault()
Test for bug where feature provided values overrode paraent provided ones.
Apply new setdefault(), load tools before setting feature config defaults, check for suite configuration completeness.
Work the refactoring of the configuration through to the build phase.
Replace old versions with new versions.