change default to _not_ include auxiliary functions in model as this …

…seems to break fewer'

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/model/model_params.pyg

@@ -5,7 +5,7 @@ def_module_params('model',
                           ('v2', BOOL, False, 'use Z3 version 2.x (x <= 16) pretty printer'),
                           ('compact', BOOL, True, 'try to compact function graph (i.e., function interpretations that are lookup tables)'),
                           ('inline_def', BOOL, False, 'inline local function definitions ignoring possible expansion'),
-                          ('user_functions', BOOL, True, 'include user defined functions in model'),
+                          ('user_functions', BOOL, False, 'include user defined functions in model'),
                           ('completion', BOOL, False, 'enable/disable model completion'),
                           ))