SimpleConfig.path differs from electrum_path when the active network has a
subdirectory (e.g. BitcoinPurple mainnet). Tests that wrote directly to
electrum_path were resolving the wrong directory; use config.path consistently.
Also reorder setUp() so config is created before any path-dependent operations
Adds unittest for Abstract_Wallet.export_history_to_file that
compares the output against reference files. This
should help to prevent regressions and ensure the layout
of the export stays static over time.
davide
f321x