Partially add documentation and remove const when not needed

include/easycsv.h

@@ -118,7 +118,7 @@ easycsv_printcolumns(const easycsv*);
 int
 easycsv_sortrow(easycsv*,
 		const char*,
-		const EASYCSV_SORT);
+		EASYCSV_SORT);
 
 /**
  * Sort column
@@ -130,44 +130,81 @@ easycsv_sortrow(easycsv*,
 int
 easycsv_sortcolumn(easycsv*,
 		   const char*,
-		   const EASYCSV_SORT);
+		   EASYCSV_SORT);
 
 /*** Modifications, insert ***/
 
+/**
+ * Insert row into CSV file
+ * @param[in] pointer to easycsv structure
+ * @param[in] cell value
+ * @param[in] row number
+ * @return easycsv error code
+ */
 int
 easycsv_insertrow(easycsv*,
 		  const char*,
-		  const int);
+		  int);
 
-/* Insert string in a specific cell */
+/** 
+ * Insert string in a specific cell 
+ * @param[in] pointer to easycsv structure
+ * @param[in] cell value
+ * @param[in] row number
+ * @param[in] column number
+ * @return easycsv error code
+ */
 int
 easycsv_insertvalue(easycsv*,
 		    const char*,
-		    const unsigned int,
-		    const unsigned int);
+		    unsigned int,
+		    unsigned int);
 
-/* Insert string in a specific cell with specific mode */
+/**
+ * Insert string in a specific cell with specific mode
+ * @param[in] pointer to easycsv structure
+ * @param[in] cell value
+ * @param[in] row number
+ * @param[in] column number
+ * @param[in] easycsv value mode
+ * @return easycsv error code
+ */
 int
 easycsv_insertvaluemode(easycsv*,
 			const char*,
-			const unsigned int,
-			const unsigned int,
-			const EASYCSV_VALMODE);
+		        unsigned int,
+			unsigned int,
+			EASYCSV_VALMODE);
 
-/* Insert string in a specific cell with named column in row 1 */
+/**
+ * Insert string in a specific cell with named column in a given row 
+ * @param[in] pointer to easycsv structure
+ * @param[in] cell value
+ * @param[in] row number
+ * @param[in] column value
+ * @return easycsv error code
+ */
 int
 easycsv_insertcolumnvalue(easycsv*,
 			  const char*,
-			  const unsigned int,
+			  unsigned int,
 			  const char*);
 
-/* Insert string in a specific cell with named column in row 1 with specific mode */
+/** 
+ * Insert string in a specific cell with named column in a given row with specific mode 
+ * @param[in] pointer to easycsv structure
+ * @param[in] cell value
+ * @param[in] row number
+ * @param[in] column value
+ * @param[in] easycsv value mode
+ * @return easycsv error code
+ */
 int
 easycsv_insertcolumnvaluemode(easycsv*,
 			      const char*,
-			      const unsigned int,
+			      unsigned int,
 			      const char*,
-			      const EASYCSV_VALMODE);
+			      EASYCSV_VALMODE);
 
 /* Modifications, push */