Change `Preload headedrs` to `Preload headers`

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>

Changed `name if the chain` to `name of the chain`

Signed-off-by: Leonid Yuriev <leo@yuriev.ru>

Seems like there are two alternative DisplayName formattings

* Extend preverified hashes for mainnet and ropsten

* Fix parsing of bad.block

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>

* Ropsten to find correct chain

* Cleanup and compile fix

* Compile fix

* Print duration of the unwind, not the timestamp

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>

* BadHashFlag added

* bad.hash to bad.block

The `>` angle brackets are unnecessary and get in the way if you copy the entire sequence.

Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>