axe

Modify library so task ids that have not been created yet can be passed to
AXEget_status, AXEwait, and as parents to AXEcreate_task.
Tests to support this feature.
Bump version number to 0.3b.
Occasional failure on wren, present before this checkin.  Cannot fix at this
time due to my inability to debug on this machine (sysadmin working on it).

Tested: ummon, jam, koala, ostrich, emu