During installation, the user may choose for Liana to configure and start bitcoind for them.
This internal bitcoind uses as its data directory the `bitcoind_datadir` folder within the
Liana data directory.
If the internal bitcoind option has been selected for a network, it will be automatically
started when the user returns to Liana and stopped when Liana is closed.
Installer has its own log file installer.log that is removed
after successful install.
When changing network, the destination log file change
to <datadir>/<network>/liana-gui.log
User is asked which network to start with.
This is a required step in case the user
start the software without a console and
can not set himself the network or launch
the install for another non existing network.
