Properly important the Python 'math' module, and use it.

In particular, I can use math.cos in the initial values.

[[Imported from SVN: r9808]]

cosserat-continuum-wong-pellegrino-wrinkling.parset

@@ -90,6 +90,4 @@ kappa = 1
 dirichletVerticesPredicate = "x[1] < 0.0001 or x[1] > 0.128 - 0.0001"
 
 # Initial deformation
-#initialDeformation = "[x[0], x[1], 0.002*cos(1e4*x[0])]"
-# Series expansion of the cosine, because I haven't figured out how to use math stuff in dunepython yet
-initialDeformation = "[x[0], x[1], 1e-15*(1- 0.5*(1e4*x[0])*(1e4*x[0]) + (1.0/24)*(1e4*x[0])*(1e4*x[0])*(1e2*x[0])*(1e4*x[0]))]"
+initialDeformation = "[x[0], x[1], 0.002*math.cos(1e4*x[0])]"

cosserat-continuum.cc

@@ -171,6 +171,7 @@ int main (int argc, char *argv[]) try
     // Start Python interpreter
     Python::start();
     Python::Reference main = Python::import("__main__");
+    Python::run("import math");
 
     //feenableexcept(FE_INVALID);