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DSOPT 1.10    30 Sep 08

 - Prototype version

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DSOPT 1.12     1 Oct 08

 - Fixed shear-layer boundary output to files  layer1.txt, layer2.txt.
   These weren't computed correctly if edge of orbit went upwind
   of the shear layer origin.  The DS calculations were unaffected.

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DSOPT 1.13     6 Oct 08

 - Fixed gravity contribution to effective acceleration
 - Added orbit-convergence and initial-guess parameters to input file

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DSOPT 1.14     23 Nov 10

 - Added transonic drag rise model.  New inputs are:
    Vsound, Mcrit0, dMcritcl, cdwcon