* fix: stmgr: make the tipset and height agree when estimating gas
Specifically re-execute all messages in the current tipset, tacking the new
message onto the end. That way, the epoch is the epoch of the current tipset.
We could try to "make" a fake block and use that, but that's unlikely to
work well.
* fix: stmgr: only apply tipset messages for CallWithGas
* fix: itest: window post dispute