Fixed debugger execution issues:

1. Allow debugging of EPAS package procedures/functions with INOUT params.
 2. Add support for indirect debugging for EPAS package procedures/functions.
 3. Allow debugging with NULL param values.
 4. Remove saved debug arguments.

Fixes #3191

web/migrations/versions/ca00ec32581b_.py

@@ -0,0 +1,34 @@
+##########################################################################
+#
+# pgAdmin 4 - PostgreSQL Tools
+#
+# Copyright (C) 2013 - 2018, The pgAdmin Development Team
+# This software is released under the PostgreSQL Licence
+#
+##########################################################################
+"""
+Deleting old debug logs
+
+Revision ID: ca00ec32581b
+Revises: aa86fb60b73d
+Create Date: 2018-08-29 15:33:57.855491
+
+"""
+
+from pgadmin.model import db
+
+# revision identifiers, used by Alembic.
+revision = 'ca00ec32581b'
+down_revision = 'aa86fb60b73d'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    db.engine.execute(
+        'DELETE FROM debugger_function_arguments'
+    )
+
+
+def downgrade():
+    pass