To facilitate easier management by users and to
follow generally accepted standards, this PR moves
the following all to user home directory, subdir
.joinmarket :
joinmarket.cfg file
wallets/ directory
logs/ directory
cmtdata/ directory
commitmentlist file
User can override location with --datadir option.
An info message is added on startup showing location.
Ensure reactor not already installed (from pyinstaller created
binaries, reactor is already installed on startup before
pyqt4reactor is imported, causing failure to start. Does not
affect non-binary Qt script run).
Qt reads daemon config flag from DAEMON section not GUI.
Typo in JMQT walkthrough guide.