Add high(est) config level for application specific config files

Some tools use an extra level to maintain an application specific config files on top of the normal ones. Revision 16adc9fa broke this.

Signed-off-by: Sven Strickroth <email@cs-ware.de>

include/git2/config.h

@@ -44,6 +44,10 @@ typedef enum {
 	 */
 	GIT_CONFIG_LEVEL_LOCAL = 4,
 
+	/** Application specific configuration file; freely defined by applications
+	 */
+	GIT_CONFIG_LEVEL_APP = 5,
+
 	/** Represents the highest level available config file (i.e. the most
 	 * specific config file available that actually is loaded)
 	 */