Merge branch 'test_omp_cluster' of...

Merge branch 'test_omp_cluster' of https://www.ict.inaf.it/gitlab/giacomo.mulas/np_tmcode into test_omp_cluster
Update make.inc to use OMP

src/make.inc

@@ -74,6 +74,9 @@ endif
 # CXXFLAGS defines the default compilation options for the C++ compiler
 ifndef CXXFLAGS
 override CXXFLAGS=-O3 -ggdb -pg -coverage -I$(HDF5_INCLUDE)
+ifdef USE_OPENMP
+override CXXFLAGS+= -fopenmp
+endif
 ifdef USE_LAPACK
 override CXXFLAGS+= -DUSE_LAPACK -DLAPACK_ILP64 
 ifdef USE_MKL