[Qgis-developer] processing - new geoalgorithme FieldsMapper

[Arnaud Morvan]

I've made a Pull Request in processing plugin with a new GeoAlgorithm.
https://github.com/qgis/QGIS/pull/1753

Can someone take a look at this (volaya or alexbruy), we would like it 
to be pulled before feature freeze.

Objective of this new QGIS GeoAlgorithm is to provide a user friendly 
tool to refactor layer fields.

It takes a standard ParameterVector as input.

 From there, the user can :

  * Change some field's names or type.
  * Add or delete some fields.
  * Reorder fields.
  * Calculate new fields based on expressions.

The result is write through a standard OutputVector parameter.

This GeoAlgorithm can be used in modeler.

Arnaud

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