[Positioning] CSV format: remove "Error" string

Result::to_csv() do not give a fixed "Error" string field before the
error value field any more.

Update comments to better document the CSV format.

owlps-positioning/src/outputcsv.hh

@@ -6,8 +6,7 @@
 
 /// Writes results to a CSV file
 /**
- * CSV format is:
- *   Mobile_MAC;Timestamp;Algorithm1;X;Y;Z;…;AlgorithmN;X;Y;Z
+ * The CSV format is documented in ResultList::to_csv().
  */
 class OutputCSV: public OutputMedium
 {

owlps-positioning/src/outputudpsocket.hh

@@ -5,8 +5,9 @@
 
 /// Sends results to a remote host by UDP
 /**
- * The results are sent through an UDP socket as a CSV string value. The
- * format used is the same as in OutputCSV.
+ * The results are sent through an UDP socket as a CSV string value.
+ * The format used is the same as in OutputCSV, and is documented in
+ * ResultList::to_csv().
  */
 class OutputUDPSocket: public OutputNetworkSocket
 {

owlps-positioning/src/result.cc

@@ -76,7 +76,12 @@ bool Result::operator==(const Result &source) const
 
 
 /**
- * @return The result as a CSV string, \em without trailing '\n'.
+ * This function creates a CSV string from the Result's data.
+ *
+ * The format used is the following:
+ *   Algorithm_name;X;Y;Z;Error;Area_name
+ *
+ * @return The result as a CSV string, \em without a trailing '\\n'.
  */
 const string Result::to_csv() const
 {
@@ -87,7 +92,6 @@ const string Result::to_csv() const
       << ';' << position.get_x()
       << ';' << position.get_y()
       << ';' << position.get_z()
-      << ';' << "Error"
       << ';' << error
       << ';' ;
 

owlps-positioning/src/resultlist.cc

@@ -46,7 +46,15 @@ bool ResultList::operator==(const ResultList &source) const
 
 
 /**
- * @return The results as a CSV string, \em without trailing '\n'.
+ * This function creates a CSV string from the Result's data.
+ *
+ * The format used is the following:
+ *   Mobile_MAC;Request_type;Timestamp;[Algorithm_1];…;[Algorithm_n]
+ *
+ * The CSV format for the [Algorithm_i] strings is documented in
+ * Result::to_csv().
+ *
+ * @return The results as a CSV string, \em without a trailing '\\n'.
  */
 const string ResultList::to_csv() const
 {