xarray::slice renamed to xarray::xslice.  API break there, to accomodate use of the lisp-matrix slice.

Signed-off-by: AJ Rossini <blindglobe@gmail.com>
example clean up
xslice'ing
00,02,04 run clean.

Signed-off-by: AJ Rossini <blindglobe@gmail.com>
README should be README.org

Signed-off-by: AJ Rossini <blindglobe@gmail.com>