Add updated information on benchmarking.
Remove the dup files without .txt.

From the source distribution.
Update the board_gen directory.

Remove make_microsoft_freecell_board.c (it is not useful), some
documents and files that were only required by GNU Autotools, and update
the README.
No longer ignore files generated by "cmake .".

One should use "cmake ../source/" instead - or "../source/Tatzer".