Some small changes to Saab 37 model

[NikolaiVChr]

@l0k1 since you are working on the model anyway, any chance you could do these small changes:

Autosmooth set to 40 deg:
gearLeftBottom, gearRightBottom, gearLeftOleoStrut, gearRightOleoStrut

And to 42 degrees:

gearleftHinge, gearRightHinge

And 45:

droptank

Small hole-like indentations similar to what the RB-71/99 have
6 RB-24J