- rest block request returns full unfolded tx details
- /rest/block/notxdetails/<HASH> returns block where transactions are only represented by its hash
1. Remove the default format (binary) because `rest/block/<hash>/Hex` would end up delivering binary data.
2. List available formats when chosen format was not found (reduces need for documentation)
3. Change url syntax to dot extension like format chosing (like `rest/tx/<hash>.json`
Jonas Schnelli