Brief installation notes

1.  untar the file blocktool.v1.0.tar:
    % tar xvf blocktool.v1.0.tar

2.  make the extract executable:
    % make extract

3.  change the reference in plot_block to the location of the
    executable, if block_tool is to be run from a remote directory.
    It is around line 102.

4.  see README_blocktool for usage.