Blank module and first draft of solver API.

At this point we have a skeleton of a new module (optim) which can
barely compile properly (unlike previous commit). Besides, there is a
first draft of solver and lpsolver (linear optimization solver) in this
commit.

modules/optim/src/lpsolver.cpp

@@ -1,45 +1,2 @@
-#include "opencv2/opencv.hpp"
-
-namespace cv {
-       	namespace optim {
-
-class Solver : public Algorithm /* Algorithm is base OpenCV class */
-{
-      class Function
-      {
-      public:
-            virtual ~Function() {}
-            virtual double calc(InputArray args) const = 0;
-            virtual double calc(InputArgs, OutputArray grad) const = 0;
-      };
-
-      // could be reused for all the generic algorithms like downhill simplex.
-      virtual void solve(InputArray x0, OutputArray result) const = 0;
-
-      virtual void setTermCriteria(const TermCriteria& criteria) = 0;
-      virtual TermCriteria getTermCriteria() = 0;
-
-      // more detailed API to be defined later ...
-};
-
-class LPSolver : public Solver
-{
-public:
-     virtual void solve(InputArray coeffs, InputArray constraints, OutputArray result) const = 0;
-     // ...
-};
-
-Ptr<LPSolver> createLPSimplexSolver();
-
-}}
-
-/*===============
-Hill climbing solver is more generic one:*/
-/*
-class DownhillSolver : public Solver
-{
-public:
-      // various setters and getters, if needed
-};
-
-Ptr<DownhillSolver> createDownhillSolver(const Ptr<Solver::Function>& func);*/
+#include "precomp.hpp"
+#include "opencv2/optim.hpp"