Fix a bug related to ProInterval

The value of ProInterval was not refreshed for each restart. This bug is
fixed in this patch.
Merge remote-tracking branch 'origin/master' into issue-68
Let CLOP functions support high dimension

CLOP functions can now evaluate two or higher dimensional solutions.
Added 2-dimensional LOG function to illustration
Added three noise-free CLOP test functions

Added noise-free LOG, ROSENBROCK, and CORRELATED functions in CLOP
paper.
Illustrated noise-free functions in CLOP