Add experimental stuff

- add ecdf module
- add expe module
- add func module
- use Dump wrapper around obj. func. instead of iters.
- add random solvers in snp options.
- add no-plot option in snp.

sho/func.py

@@ -0,0 +1,26 @@
+
+########################################################################
+# Wrappers around objective functions
+########################################################################
+
+class Dump:
+    """A wrapper around an objective function that
+    dumps a line in a file every time the objective function is called."""
+
+    def __init__(self, func, filename="run.csv", fmt="{it} ; {val} ; {sol}\n", sepsol=" , "):
+        self.func = func
+        self.filename = filename
+        self.fmt = fmt
+        self.sepsol = sepsol
+        self.counter = 0
+        # Erase previous file.
+        with open(self.filename, 'w') as fd:
+            fd.write("")
+
+    def __call__(self, sol):
+        val = self.func(sol)
+        self.counter += 1
+        with open(self.filename, 'a') as fd:
+            fmtsol = self.sepsol.join([str(i) for i in sol])
+            fd.write( self.fmt.format(it=self.counter, val=val, sol=fmtsol) )
+        return val