Add cross reference between SCons Configure Context and CMake equivalents

[bdbaddog]

Add cross reference between SCons Configure Context and CMake equivalents

Either in Wiki or in Appendix to Users guide..

[bdbaddog]

Maybe also add cross ref with autoconf/automake? Though I think the checkers should be named the same.

[mwichmann]

I don't use cmake, so don't know about this.

Someone tried to create autoconf xref in wiki, it may predate the current configure implementation, don't know.