SHP provider: Allow creating localized field names

[danstoica]

Currently the SHP provider follows strictly the DBF specification when creating new DBF files and replaces the localized names with ASCII "FieldNNN" names. This defect calls to relax the behavior and generate proper multibyte field names (e.g. Japanese or Chinese).

NOTE1: reading the localized field names is already in place.

NOTE2: in order to produce DBF files with localized field names the application must either A) run on a machine with the proper locale or B) a SetLocale() should be called before Apply schema.