[enh] #162: sort imports in every files

duniterpy/api/bma/__init__.py

duniterpy/api/bma/blockchain.py

duniterpy/api/bma/network.py

duniterpy/api/bma/tx.py

duniterpy/api/bma/wot.py

duniterpy/api/client.py

duniterpy/api/endpoint.py

duniterpy/api/ws2p/__init__.py

duniterpy/api/ws2p/requests.py

duniterpy/documents/__init__.py

duniterpy/documents/block.py

duniterpy/documents/block_uid.py

duniterpy/documents/certification.py

duniterpy/documents/crc_pubkey.py

duniterpy/documents/document.py

duniterpy/documents/identity.py

duniterpy/documents/membership.py

duniterpy/documents/peer.py

duniterpy/documents/revocation.py

duniterpy/documents/transaction.py