This commit adds the code for FLO chunk verification. FLO chunk verification is different from Bitcoin chunk verification as the blockchain has 3 different target recalculation times. ie. 90 blocks at height 0->208440, 15 blocks at height 208440->426000 & 1 block further down
Changes have also been maded such that chunk doesnt need to be saved in parts
After the introduction of arguments for -v, it would sometimes incorrectly consume the CLI cmd as its argument.
This change keeps the old "-v" syntax working, at the cost of having to provide the arguments without a whitespace directly after -v (and the args need to be single letters).
