overflow handlings and garbage collection Several ipdates to CLPBN dif/2 could be broken in the presence of attributed variables. git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1474 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1354 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
only works for non-deterministic CPTs, of course. git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1284 b08c6af1-5177-4d33-ba66-4b1c6b8b522a