cad/openvsp: update to 3.19.1

ChangeLog:
http://openvsp.org/blogs/announcements/2019/11/18/openvsp-3-19-1-released

Features:

• Add rotating blade examples for VSPAERO
• Let vspviewer accept *.adb in file name passed, helps with double-click
• Use less precision in M,A,B list from GUI to VSPAERO - long command lines
• Clean up some warnings in VSPAERO code
• Update VSPAERO command line documentation

Bug Fixes:

• Fix field ordering in DegenGeom file - this broke VSPAERO
• Fix problem with image backgrounds
• Remove XS_BEZIER reference from Python test
• Improve Ubuntu package to remove prior version
• Fix PathToExe for FreeBSD