XML-RPC dumps None to nil instead of bool

issue3981
review6351003
Add test for XML-RPC dumps None to nil

issue3981
review6351003
Fix SQLite Numeric domain value for None

issue3930
review11281002
Add test numeric search with None

issue3930
review11281002
Allow to sync XML data

- Adds menu entry for ir.model.data
- Remove write access on ir.model.data to administrator group
- Add sync button on ir.model.data
- Change storage format of values to be comparable

issue3918
review8351002