This teaches the bootstrap shell script to detect the CMake source
directory from which it is executed using a simpler idiom.

BUG: Rename Bootstrap directory to Bootstrap.cmk, so that on platforms such as Windows and Mac OSX it will break during in-source build

Improve bootstrapping on Unix, so that it bootstraps in the subdirectory. This prevents from compiler files being reused and you can do make clean...

ERR: AC_SUBST replaced with AC_DEFINE.  Needed to get configure script to correctly setup cmConfigure.h.

ENH: Re-ran autoconf to include changes to corresponding configure input.  This adds a test for the availability of sstream.

ENH: big change, only allow commands access to the cache via the cmMakefile class and GetDefinition, also the cmMakefile is the only way for commands to add to the cache.  Also, some changes to configure.in that check for for scoping