Some propeller changes

I've been working on a new prop configurator for AeroMatic. This one builds a more complete set of tables, from a beta of -10 to +90 degrees for constant speed props. All you have to tweak manually is the min and max prop angles. I've tested it the F7F model, where I set the blade angle limits to the range 18-50. The new model is version 1.4.

Some things to look out for when using the new prop configs:

1) If you set the min blade angle too large, the engine starter won't be strong enough to start the engine. In this case you have to either decrease the min angle, or decrease the engine idle speed. Your idle thrust will be higher than before.

2) There are no Mach effects in the prop code, so your dive speed will be a bit higher than you'd expect. I'm working on this.

3) I saw somewhere that the blade angle range for the P-51 was 20-55, so that should give a ballpark range for high-speed applications.