Rename the action get_api as dbui_conf.

Introduce a new helper function get_file_paths.
Redesign index and debug controller as well as the associated view.

- Modify the cfgsvc.get_configuration to return None
- Modify the model to run a simple report
- Modify the appviewport to handle the case of a panel with an url
- Modify the controller reports/report_1 to run with the current
  database definition

It seems to speed up the download.

Add the view for the plugin_dbui

The order matter when calling the javascript library.
Start with the script defining constants.

It is base on the Ext.Direct technology.
In this approach the configuration of the form or grid are performed on demand.

Rely on the Ext.Direct technology.

Keep ionly the "final" structure and files

Improved version with global variables and a clear separation between librairies and application scripts.

Modified to add global variable.
Prepare space for a loading indicator.