Adder the type alias error_t and refactored the code to use it. also extracted archive function from install.c to archives.c

src/fomod/xmlUtil.h

@@ -7,12 +7,24 @@
 
 typedef enum FOModOrder { ASC, DESC, ORD } FOModOrder_t;
 
+/**
+ * @brief
+ *
+ * @param node a pointer to the current node pointer (xmlNode **)
+ * @param skipText if a text element is found skip it.
+ * @param names variadic of the valid names.
+ * @return return true if it found a valid node
+ */
 bool validateNode(xmlNodePtr * node, bool skipText, const char * names, ...);
+
 /**
  * @brief Free memory of and xmlChar and return a strdup version. just to make sure there is nothing remaining in libxml
  */
 char * freeAndDup(xmlChar * line);
+
+
 FOModOrder_t getFOModOrder(const char * order);
+
 /**
  * @brief replace / by \
  * @param path