Support BMA optimizations

• Use DuniterPy dev from git
• Use optimizations: duniterpy#201 (closed): Set pubkey_query=True to wot path
• silkaj.money.tools::get_sources(): receiving/pending transfers are no longer part of bma.tx.sources. Adapt get_sources()?
• Test all Silkaj commands against Duniter v1.8.7/BMA and Duniter v1.8.6 (for compatibility check)
• Switch DuniterPy usage back to PyPI release (#483 - closed)