Rename the dbui language files.

Rename the action get_api as dbui_conf.

- remove the service CvtSvc
- introduce a new module extjs containing a configurator class for each ExtJS component.
- introduce a new module converter containing helper function transforming web2py dal object into ExtJS configurator.
- deploy configurator in the rest of the code.
- define an xtype forl the App.Viewport class.
- Remove the widget class and transform the Spacer into a configurator.
- clean the navtree module. Helper function are replaced by configurator

Modify controller accordingly.

 - remove environment argurments and used gluon.current instead.
 - add is_mathjax ans used it.

 - remove environment argumenst and used gluon.current instead.
 - add is_mathjax ans used it.

 - Use the gluon.dal.Table and Field instead of tablename and fieldname
 - Rename cfgSvc as cvtSvc and all methods
 - break the foreign field service into a set of helper functions
 - break the setfield service into a set of helper functions
 - polish documentation and remove obsolete modules

navigation tree.

- Add new modules navtree and the class NodeBase and NodeDB
- Redesign the viewport_modifier and the cfgsvc.get_tree method
- Remove the obsolete method cfgsvs.get_tables
- Sort properly list according to the locale language

Polish the documentation of appbase.js

Replace the constant App.withMathJax by App.mathJax with is the path to the mathjax script.
Modified accordingly the function to load the library.

It is fill by the controller get_api.

Deploy it in all DbSvc method.
remove the dependence to basesvc.
Use the new helper function as_list

New naming convention.
Remove the configuration controler.

Add 3 tools: define_combined_field, define_field_set and define_wizard.
Draft version of define_field_set.