Add euslisp package for qpOASES, which is a qp solver

Add checkout package for qpOASES[1-3].
Add euslisp defforign codes, euslisp interface, and example code to use it.

[1] Web Page1: http://set.kuleuven.be/optec/Software/qpOASES-OPTEC
[2] Web Page2: https://projects.coin-or.org/qpOASES
[3] Manual (PDF) : http://www.coin-or.org/qpOASES/doc/3.0/manual.pdf