(In revision:956d055d872ec19f8944b217a89a60e220636bef) make currentMessage available in preRestart, test #957

- use Option[Any] since currentMessage may be unavailable (supervisor
being restarted)
- plus docs

Branch: ticket955

(In revision:192b8da4c4958b1679a6f2703ed4b9f620c9d92d) make currentMessage available in preRestart, test #957

- use Option[Any] since currentMessage may be unavailable (supervisor
being restarted)
- plus docs

Branch: release-1.2

Hi Roland,

the ticket is assigned to you, but currently is in the test state. I guess it needs to be verified by someone else? If you want you can assign it to me and I'll verify it.

Updating tickets (#955, #957)

Branch ticket955 was reviewed by Viktor before porting to release-1.2, now I merged it into master. Please take a look whether the unfortunate lack of proximity in time caused some unwanted side effects.

We should probably do some marketing for the @experimental annotation …

Updating tickets (#818, #821, #823, #836, #842, #854, #856, #865, #866, #867, #868, #869, #871, #872, #873, #877, #878, #879, #885, #888, #889, #890, #894, #910, #911, #917, #923, #924, #925, #926, #927, #928, #930, #931, #932, #933, #934, #936, #937, #952, #955, #957, #958, #959, #960, #961, #964, #965, #966)