Feature/fix warnings

We should be able to compile using -Wall -Wextra -Werror.

Currently the easy fixes are done, but in the Unstructured load balancer many variables are declared (and set), but not used. I assume, this is the case due to the in progress state of the method.

Other open problems are:

• unused parameters for some implementations of setAdditionalData. If these declaration have to be there we may silence them with proper annotations (for GCC: __attribute__((unused))(ref), which should be put into a compiler dependant preprocessor switch to also set this for clang etc. as well as for readability. Maybe known_unused is a good keyword)
• ignored const on function return (ALL_LB.hpp:163: const int getNVertices() { return vertices.size(); })

This branch should only be merged to refactor after !9 (merged) has been merged!.

tests/all_class_creation.cpp

@@ -46,7 +46,7 @@ BOOST_AUTO_TEST_CASE(empty) {
   if (!already_init)
     MPI_Init(NULL, NULL);
 
-  ALL<double, double> test();
+  ALL::ALL<double, double> test();
 
   int already_final;
   MPI_Finalized(&already_final);
@@ -60,11 +60,11 @@ BOOST_AUTO_TEST_CASE(simple) {
   if (!already_init)
     MPI_Init(NULL, NULL);
 
-  ALL_LB_t method = ALL_LB_t::TENSOR;
+  ALL::LB_t method = ALL::TENSOR;
   int dimension = 3;
   double gamma = 4.0;
 
-  ALL<double, double> test(method, dimension, gamma);
+  ALL::ALL<double, double> test(method, dimension, gamma);
 
   double check_dim = test.getDimension();
   double check_gamma = test.getGamma();
@@ -75,4 +75,4 @@ BOOST_AUTO_TEST_CASE(simple) {
     MPI_Finalize();
 }
 
-BOOST_AUTO_TEST_SUITE_END()
+BOOST_AUTO_TEST_SUITE_END()
\ No newline at end of file