Updated the "water jug" state space search example with predicate comments contributed by Michael Igler.
Updated the "water jug" state space search example with predicate comments contributed by Michael Igler.

git-svn-id: 4c7b768bc2e2a56aa1c56b1b5a9454ba68342430@5083 ac9c905b-388a-4ddf-9b6a-4063a022bc57

LogtalkDotOrg/logtalk2,LogtalkDotOrg/logtalk2,LogtalkDotOrg/logtalk2,LogtalkDotOrg/logtalk2,LogtalkDotOrg/logtalk2