correct brick dimensions from ba files, if possible.

things break in weird ways if they don't match.  can only do this
if we're loading a .ba file; the information isn't available in
other files.

the gigantic diff comes because I fixed the line endings in ba-file*.
number of bricks can be read from file; don't check

avoid an error message when these are wrong, because we (might)
fix them up later (if we are reading a .ba file).
add some data files that can be used for testing.