Dirac solver

The python version of bound constrained LBFGS is added and ready for testing (will be moved to C in the meantime). To build with libdirac, use cmake option -DLIBDIRAC_PREFIX=/path/to/libdirac/install

idg-bin/tests/cxx/common/common.cpp

@@ -11,7 +11,7 @@
 #include <complex>
 #include <limits>
 
-//#define PRINT_ERRORS
+// #define PRINT_ERRORS
 
 // computes sqrt(A^2-B^2) / n
 float get_accuracy(const int n, const std::complex<float>* A,