Improve robustness of {{{Pool}}} class as suggested in #1401.  We do this by delaying the destruction of a parent pool until it's child pools have been destroyed.
Improve robustness of {{{Pool}}} class as suggested in #1401.  We do this by delaying the destruction of a parent pool until it's child pools have been destroyed.
pkdevbox/trac,pkdevbox/trac,pkdevbox/trac,pkdevbox/trac