continue: added support for transplant...
continue: added support for transplant
This creates a seperate function `continuetransplant()`
containing logic for resuming transplant from interrupted
state.
`continuetransplant()` is then registered as `continuefunc`
for state detection API.
Results are shown in tests.
Differential Revision:
https://phab.mercurial-scm.org/D6689