- A error_strerror function() has been added to translate between error codes and their description.

- The error codes have been remapped and combining error codes is now done with a PLUS instead of an OR as error codes used are negative.
 - Descriptions to all error codes have been added.
 - Generation script for error.c has been created to automatically generate error.c from the available error definitions in the headers.

include/polarssl/config.h

@@ -323,6 +323,18 @@
  */
 #define POLARSSL_DHM_C
 
+/**
+ * \def POLARSSL_ERROR_C
+ *
+ * Enable error code to error string conversion.
+ *
+ * Module:  library/error.c
+ * Caller:
+ *
+ * This module enables err_strerror().
+ */
+#define POLARSSL_ERROR_C
+
 /**
  * \def POLARSSL_HAVEGE_C
  *