FlightGear - Flight Simulator FGAddon

* Bug fix: make the cockpit instruments appear in the bomber variant.
* Bug fix: make the RPM indicator needles rotate correctly.
* Models/Instruments/ignition-gb/ignition[12].xml: factorize into ignition.xml.
* Models/Instruments/rpm-[ps].xml: factorize into rpm.xml.
* mosquito-common.xml: new; factorize most of the mosquito model.
Do not start with engines running; }}s works.
Add a rating.
* mosquito-fbVI-set.xml, mosquito-set.xml: include the above.
* Models/cockpit.xml: bug fix: relocate the beam_approach instrument to make
it visible.
* Models/Instruments/rpm5k-gb/*: delete, redundant with rpm.*