got 0.72

- fix "bad offset in pack file" error due to uninitialized variable (op)
- initialize all variables used for sending privsep messages to zero (op)
- tog: reset search state after Ctrl-L to fix a use-after-free (op)
- fix unexpected imsg error after incomplete enumeration in got-read-pack
- tog: heed selection cursor position while searching (patch by Mikhail)