Chain height vs Latest block

[sesam]

Chain height is based on best known chain (tot.diff.) while Latest block is whatever was most recently seen.

Separate this, so one block of info is about the best chain, and another block of info is about alternative chains that may have newer blocks.

Best would be to show several alternative forks, that can be "named" and sorted by falling tot.diff similar to how debug outputs show (or will show) that info
tot_diff @ height (hash)