CLEANUP: Somewhat nicer interface for the segstack code and pl-bags.c (findall).
CLEANUP: Somewhat nicer interface for the segstack code and pl-bags.c (findall).

jn7163/swipl-devel,mndrix/swipl-devel,edechter/swipl-devel,mndrix/swipl-devel,jn7163/swipl-devel,koryonik/swipl-devel,mndrix/swipl-devel,koryonik/swipl-devel,edechter/swipl-devel,koryonik/swipl-devel,jn7163/swipl-devel,mndrix/swipl-devel,jn7163/swipl-devel,edechter/swipl-devel,koryonik/swipl-devel,jn7163/swipl-devel,mndrix/swipl-devel,edechter/swipl-devel,edechter/swipl-devel,koryonik/swipl-devel