Patch applied in r18405. Hack described in Configure.pl and found in Parrot::Configure::Step is fixed by making Parrot::Configure object into a singleton. This entailed changes in those two packages as well as config/init/defaults.pm.
Also: Parrot::Configure::Data::slurp() now checks Parrot::Config::Generated rather than Parrot::Config to determine if configuration has been completed. 12 test files added to directory t/configure; t/configure/configure.t eliminated because it assumed non-singleton Parrot::Configure object. 7 .pm files added for testing in new directory t/configure/testlib/. 1 new test file added to new directory t/postconfigure/, which will house tests pertaining to configuration that can only be run once Configure.pl has been executed. 'postconfigure' added to @default_tests in t/harness. MANIFEST updated to reflect new files and one deletion. Application of this patch results in same %Parrot::Config::Generated::PConfig as previous version of Configure.pl and associated files. All tests in 'make test' pass.
