A status bar widget allows access to configure,
and start/stop a yield generator (maker) bot
in the background. While running, taker functions
are disabled as well as wallet changing functions.
Other functionality is still available.

while in maker mode, and deposits (although
there is no sophisticated tx type parsing).
The location of the corresponding history
file is fixed to the datadir correctly.
Also fixed Maker start/stop for non-Tor case.

Also various small fixes to strings and info text,
and validation of inputs and tooltips.

generateAction etc. must be instance vars
so that they can be toggled inactive.