parser xml CHANGE major refactorization

Completely new XML parser and also some
schema parser refactoring.
diff --git a/src/context.h b/src/context.h
index a3c6366..53634cd 100644
--- a/src/context.h
+++ b/src/context.h
@@ -172,7 +172,7 @@
                                         recursively). */
 #define LY_CTX_PREFER_SEARCHDIRS 0x20 /**< When searching for schema, prefer searchdirs instead of user callback. */
 
-/**@} contextoptions */
+/** @} contextoptions */
 
 /**
  * @brief Create libyang context.