fix doxygen and put everything besides main function in namespace ebusd

src/lib/ebus/data.h

@@ -30,7 +30,9 @@
 #include "lib/ebus/filereader.h"
 #include "lib/ebus/datatype.h"
 
-/** @file data.h
+namespace ebusd {
+
+/** @file lib/ebus/data.h
  * Classes related to defining fields based on data types in symbols on the
  * eBUS.
  *
@@ -46,8 +48,6 @@
  * class.
  */
 
-namespace ebusd {
-
 class DataFieldTemplates;
 class SingleDataField;