FlightGear - Flight Simulator FGAddon

Fix for the Sopwith Camel YASim aircraft (sopwithCamel-YASim) for the FGAddon split.

See the thread at http://thread.gmane.org/gmane.games.flightgear.devel/77465 for
discussions.

After the split of the FGAddon repository from FGData, the sopwithCamel-YASim
aircraft would fail to start, instead showing a "FATAL" error. The problem was
the use of a relative path to ../Generic/ which no longer exists. Changing this
to Aircraft/Generic/ in the XML file fixes the path issue.

737-300: Added info about soundfiles to readme file.

Change the way the steering column works, the previously was modeled after an improper replica. Fis some small issues.

Lockheed1049h version 2.0.4: remember payload settings for the next take-off.

A lowered model offset requires a lowered view offset

Use relative paths, add support for pushback (manual off course) and initialize with chocks (but do not active it in the FDM since it requires a pending code change)

Fix#1, part 2 for UIUC Aircraft, ref: http://thread.gmane.org/gmane.games.flightgear.devel/77094.

This should have been part of revision r469 but was missed as the XML files had
the subversion property svn:mime-type set to "application/xml". The files were
hence treated as binary files and no diff for the sopwithCamel was produced for
the 'flightgear-fgaddon_del_aircraft-dir.patch' patch attached to
http://thread.gmane.org/gmane.games.flightgear.devel/77094/focus=77214.

757-200: minor update to paintkit

Lockheed1049h: fuel and payload improvements

It is now possible to reach and greatly exceed the maximum take-off weight
of 137,500 lbs and push the center of gravity aft of the main landing gear.
Be careful when loading your ship!

* Lockheed1049h.xml, Lockheed1049h-common.xml: Add the cabin and cargo hold
capacity and positions per the Aircraft Specification No. 6A5 as published
by the FAA.
* Lockheed1049h.xml: adjust the position of the fuel tanks according to the
same document.
* Help/help.xml: document the center of gravity limits, per the same document;
I don't know how to make them appear in the Fuel and Payload dialog.
* Models/Lockheed1049h_Cockpit.xml: illuminate the dashboard with the cabin
light, too.
* Systems/Lockheed1049h-init-fuel.xml: name all tanks for the Fuel and Payload
dialog.

737-300: Big update - fully new autopilot, enhanced FDM, improved 3D cockpit, new engine sound, correct logic for air-ground system, autobrake, spoilers.