First converter is ready: llsp2nlp

I have committed some changes, so LLSP class has new form:

0.5*||C*x-d||2 + 0.5*damp*||x-X||2 + fTx-> min

subjected to:
 lb <= x <= ub  

A*x <= b, Aeq*x = beq constraints are intended to be added in future.

Using llsp2nlp converter is performed via

r = p.solve('nlp:NLPSolverName')

for example
r = p.solve('nlp:ralg')

For more details read LLSP webpage.