Add config file for CBLAS

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/scalfmm/scalfmm/trunk@51 2616d619-271b-44dc-8df4-d4a8f33a7222

Sources/ScalFMM_config.h.cmake

+#ifndef ScalFMM_CONFIG_H
+#define ScalFMM_CONFIG_H
+
+#cmakedefine SCALFMM_USE_MKL
+
+#endif // CONFIG_H