gmoccapy_1_0_7_1 - bugs solved and introduced logging to file

ver.1.0.7.1
- when a external ESTOP was active and the tbtn_estop has been clicked
  it changed its color, but should not do so, solved
- when external estop was active, it was possible to click the on button
  and the GUI changed state making several widgets sensitive, that behavior
  was wrong, solved that.
- If you feed override has been changed and the machine went into estop,
  a estop reset also reseted feed override to 100 % , now it will remain with
  the value it had bevore estop.
- If a user activate logging actions, the logging was lost after shutting
  down the GUI, now the conmtent of alarm_history will be written to a
  file called gmoccapy.log in your config dir. The file will be overwritten
  on each shutdown of gmoccapy with the new content.
- EXIT Button is now only sensitive, when machine is switched off, so it is
  not longer possible to accidently shut down the machine.
- pressing estop from MDI mode with spindle on, resulted in an error, solved.