fix doxygen and put everything besides main function in namespace ebusd

src/lib/ebus/contrib/contrib.h

@@ -19,13 +19,13 @@
 #ifndef LIB_EBUS_CONTRIB_CONTRIB_H_
 #define LIB_EBUS_CONTRIB_CONTRIB_H_
 
-/** @file contrib.h
+namespace ebusd {
+
+/** @file lib/ebus/contrib/contrib.h
  * Contributed sources that may be excluded from regular builds.
  * configure switch: --without-contrib
  */
 
-namespace ebusd {
-
 /**
  * Registration function that is called once during initialization.
  * @return true if registration was successful.

src/lib/ebus/contrib/tem.h

@@ -30,12 +30,12 @@
 #include "lib/ebus/result.h"
 #include "lib/ebus/datatype.h"
 
-/** @file tem.h
- * Contributed data types for TEM devices not part of regular releases.
- */
-
 namespace ebusd {
 
+/** @file lib/ebus/contrib/tem.h
+ * Contributed data types for TEM devices not necessarily part of regular releases.
+ */
+
 /**
  * A special variant of @a NumberDataType for TEM/Dungs ParamID in master/slave
  * data.