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.

Create the controller for the plugin_dbui which contains the old controllers configuration.py and database.py