tree printer CHANGE for augment nodes print their module name as prefix

prefix of the module is not unique, so in the tree output, use module
names instead the module prefix.

Relates to #24

src/printer_tree.c

@@ -120,7 +120,7 @@ get_max_name_len(const struct lys_module *module, const struct lys_node *node)
                 (LYS_CHOICE | LYS_CONTAINER | LYS_LEAF | LYS_LEAFLIST | LYS_LIST
                 | LYS_ANYXML | LYS_CASE)) {
             mod = lys_mainmodule(sub);
-            name_len = strlen(sub->name) + (module == mod ? 0 : strlen(mod->prefix)+1);
+            name_len = strlen(sub->name) + (module == mod ? 0 : strlen(mod->name)+1);
             if (name_len > max_name_len) {
                 max_name_len = name_len;
             }
@@ -212,7 +212,7 @@ tree_print_container(struct lyout *out, const struct lys_module *module, int lev
 
     nodemod = lys_mainmodule(node);
     if (module != nodemod) {
-        ly_print(out, "%s:", nodemod->prefix);
+        ly_print(out, "%s:", nodemod->name);
     }
 
     ly_print(out, "%s%s", cont->name, (cont->presence ? "!" : ""));
@@ -262,7 +262,7 @@ tree_print_choice(struct lyout *out, const struct lys_module *module, int level,
 
     nodemod = lys_mainmodule(node);
     if (module != nodemod) {
-        ly_print(out, "%s:", nodemod->prefix);
+        ly_print(out, "%s:", nodemod->name);
     }
 
     ly_print(out, "%s)%s", choice->name, (choice->flags & LYS_MAND_TRUE ? "" : "?"));
@@ -303,7 +303,7 @@ tree_print_case(struct lyout *out, const struct lys_module *module, int level, c
 
     nodemod = lys_mainmodule(node);
     if (module != nodemod) {
-        ly_print(out, "%s:", nodemod->prefix);
+        ly_print(out, "%s:", nodemod->name);
     }
 
     ly_print(out, "%s)", cas->name);
@@ -354,8 +354,8 @@ tree_print_anyxml(struct lyout *out, const struct lys_module *module, char *inde
     prefix_len = 0;
     nodemod = lys_mainmodule(node);
     if (module != nodemod) {
-        ly_print(out, "%s:", nodemod->prefix);
-        prefix_len = strlen(nodemod->prefix)+1;
+        ly_print(out, "%s:", nodemod->name);
+        prefix_len = strlen(nodemod->name)+1;
     }
 
     ly_print(out, "%s%s%*sanyxml", anyxml->name, (anyxml->flags & LYS_MAND_TRUE ? " " : "?"),
@@ -406,8 +406,8 @@ tree_print_leaf(struct lyout *out, const struct lys_module *module, char *indent
     prefix_len = 0;
     nodemod = lys_mainmodule(node);
     if (module != nodemod) {
-        ly_print(out, "%s:", nodemod->prefix);
-        prefix_len = strlen(nodemod->prefix)+1;
+        ly_print(out, "%s:", nodemod->name);
+        prefix_len = strlen(nodemod->name)+1;
     }
 
     ly_print(out, "%s%s%*s", leaf->name, ((leaf->flags & LYS_MAND_TRUE) || is_key ? " " : "?"),
@@ -446,7 +446,7 @@ tree_print_leaflist(struct lyout *out, const struct lys_module *module, char *in
 
     nodemod = lys_mainmodule(node);
     if (module != nodemod) {
-        ly_print(out, "%s:", nodemod->prefix);
+        ly_print(out, "%s:", nodemod->name);
     }
 
     ly_print(out, "%s*%*s", leaflist->name, 3 + (int)(max_name_len - strlen(leaflist->name)), "   ");
@@ -482,7 +482,7 @@ tree_print_list(struct lyout *out, const struct lys_module *module, int level, c
 
     nodemod = lys_mainmodule(node);
     if (module != nodemod) {
-        ly_print(out, "%s:", nodemod->prefix);
+        ly_print(out, "%s:", nodemod->name);
     }
 
     ly_print(out, "%s*", list->name);