Patch to add project_solution/project_vector methods using
FEMFunctionBase objects. Still untested.
PopLog needs to match PushLog name.
Use default grainsize for system_projection functions.
Only get dphi for C1 continuous elements in ProjectFEMSolution.
More bugfixes in ProjectFEMSolution. Thanks to Roy for privately pointing
out the context.side issue.
Merge pull request #21 from pbauman/femfunction

Add System::project_solution/System::project_vector methods utilizing FEMFunctionBase functors