* buildscripts/output-distance.py (me_path): use argv[0] for

* buildscripts/output-distance.py (me_path): use argv[0] for
sys.path extension
(ComparisonData.img_cell): use colored borders.

* scm/stencil.scm (write-system-signature): escape newlines too.
(write-system-signature): use (1,-1) interval for empty interval