getting lost coins from inactive validators

[SurfingNerd]

See whitepaper: 5.5 Reinsert pot:
... when validators are inactive for 10 years...

we need to set the validatorLastSuccess mapping to the current timestamp when the validator became available.
it is currently not used, and we can rename this variable to validatorAvailableSinceLastWrite, or suggest a better name.

it should resemble when the last "available since" was written, but never turns 0 again.

to figure out if a validator was available or not since 10 years we have to check if 10 years have passed since the last write of availability, or if the validator was available since 10 years.

Implement as public available function that move all coins (those from validator candidates and those that have delegated coins on it.

https://bit.diamonds/wp-content/uploads/DMD_wp.pdf

because of time manipulation within the contracts: #175