[+] Datum now inherits from dap_chain_t
[*] Lot of small changes

[-] srv files moved to lib-dap-chain-srv*
[*] Other moves and renames, sections->datums

[+] Declarations for chain operations
[+] Block cache
[+] Block dump
[*] Some internal fixes

[+] Wallet delcarations

[+] Transactions and transaction items
[*] Some renames mostly related to section