Doxygen documentation corrected and completed.

src/obierrno.h

@@ -1,20 +1,26 @@
-/*
- * obierrno.h
- *
- *  Created on: 23 mai 2015
- *      Author: coissac
+/****************************************************************************
+ * Header file for obi errnos                                               *
+ ****************************************************************************/
+
+/**
+ * @file obierrno.h
+ * @author Eric Coissac (eric.coissac@metabarcoding.org)
+ * @date 23 May 2015
+ * @brief Header file for obi errnos.
  */
 
+
 #ifndef OBIERRNO_H_
 #define OBIERRNO_H_
 
+
 /**
  * @brief The declaration of the external variable `obi_errno`.
  *
  * `obi_errno` is an equivalent of `errno` for the system level error,
- * but for errors generated by the C layer of the OBITools framework.
+ * but for errors generated by the C layer of the OBITools3 framework.
  *
- * @todo We have to look into defining this variable as thread specific.
+ * @TODO We have to look into defining this variable as thread specific.
  */
 extern int obi_errno;
 
@@ -24,8 +30,8 @@ extern int obi_errno;
  *        the specified `err` code
  *
  * This function is defined as a macro to reduce the risk
- * of increasing the problem generating the error by calling
- * a new function.
+ * of increasing the problem by generating another error by calling
+ * another function.
  *
  * @param err The error code as an integer value.
  *
@@ -41,6 +47,8 @@ extern int obi_errno;
  * Error codes set in errno following an error related
  * to the manipulation of an OBIDMS.
  *
+ * @TODO
+ *
  * @{
  */
 #define OBIDMS_EXIST_ERROR     		(1) 	/**< Trying to create an OBIDMS with a name