Obsolete interface to Monero

[AlexAltea]

This repository still specifies the network type (i.e. testnet vs stagenet) as bool rather than the newer cryptonote::network_type enum type used by more recent Monero versions. This causes some build issues when compiling against these newer Monero versions.

There's also other lingering issues, mostly can be fixed with a bit of manual effort (which is what I did, though my changes are hacky/dirty/untested enough and not worthy to be upstreamed).

[moneroexamples]

Sorry, butlmdbcpp-monero example is not being maintained any more. But if you want to update it to work with current monero version, a pull request is always welcomed.