New release R20210331

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Release primarily fixing small bugs and some small improvements.

Main fixes and additions

• Support for MathWorks second-order cone solver CONEPROG.
• Support for second-order cone constraints in XPRESS.
• Fixed bug related to cosine applied on vectors.
• Fixed bug causing x^y to fail with BARON
• Fixed bug causing trivially non-sos problems crash in solvesos.
• Fixed bug causing the robust optimization module allow uncertain integers.