readAll method now works correctly for duplicates mode, testing, some doc fixes

src/storage.cpp

@@ -23,6 +23,8 @@
 /**
  * \class LMDBAL::iStorage
  *
+ * \brief Storage interface
+ *
  * This is a interface-like class, it's designed to be an inner database interface to
  * be used as a polymorphic entity, and provide protected interaction with the database
  * from the heirs code