Just a quick update:
From really struggling with the checks for gravitating objects around the site of a bomb explosion in XorGramana, I discovered a bug in XorCurses: it was missing one of these checks such that in a certain situation a gravitating object (ie a fish or chicken in XorCurses) would remain motionless after a bomb had exploded what-ever-it-was that had previously blocked the gravitation path of that object - it would just sit there!
Just go to XorCurses - the latest version (at this time http://www.jwm-art.net/art/archive/XorCurses-0.0.7.tar.bz2) will always be down-loadable from there, from now on.
I'd better mention that this bug did not effect atleast the first eight levels. I don't know if it would have effected levels nine to fifteen or not because I have not yet completed them.