Add showdebugging and showsql options to admin/cli/uninstall_plugins.php

1. Turn off debugging: php admin/cli/cfg.php --name=debug --set= 0 2. Run the command from CLI: php admin/cli/uninstall_plugins.php 3. Confirm , that help section has  showsql and  showdebugging mentioned. 4. Run the command from CLI: php admin/cli/uninstall_plugins.php --plugins=auth_none --showsql 5. Confirm , that the output shows SQLs. 6. In order to emulate exception, edit /admin/cli/uninstall_plugins.php file and add the following code  here  (line 103): throw new coding_exception( "Test" );  7. Run the command from CLI: php admin/cli/uninstall_plugins.php --plugins=auth_none --showdebugging 8. Confirm , that the output shows debugging, something similar to: Default exception handler: Coding error detected, it must be fixed by a programmer: Test Debug: Error code: codingerror * line 103 of /admin/cli/uninstall_plugins.php: coding_exception thrown !!! Coding error detected, it must be fixed by a programmer: Test !!! !! Error code: codingerror !! !! Stack trace: * line 103 of /admin/cli/uninstall_plugins.php: coding_exception thrown !!