make an RC (in fact just for Gernot to have a tag for testing doc generation)

src/pEpEngine.h

@@ -36,9 +36,10 @@ extern "C" {
 #define PEP_ENGINE_VERSION_PATCH 0   // the last already-released or
                                      // being-released patchlevel,
                                      // which must always be defined
-#define PEP_ENGINE_VERSION_RC    6   // the last already-released RC for this
+#define PEP_ENGINE_VERSION_RC    7   // the last already-released RC for this
                                      // patchlevel, or not defined if not an RC
-#define PEP_ENGINE_VERSION_PLUS  +   // Only defined for tagged versions
+//#define PEP_ENGINE_VERSION_PLUS  +   // Only defined when the repo is in a
+                                     // non-released non-RC state.
 
 /* The following macros serve to machine-generate a definition of
    PEP_ENGINE_VERSION, following the correct format as a string, from the