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WIP: feature--add_c++_classes_tmp_corrections

Corentin Roussel requested to merge Feature--PDI--Add_C++_classes_tmp_correction into master

This branch removes some of PDI limitations:

  1. PDI_data_t are replaced with PDI::Data_ref, PDI::Data_descriptor and PDI::data_content
  2. Introduce C++11 into PDI

1- New classes

PDI_::Data_content: This class is used to handle a buffer that contain a dataset.

PDI::Data_ref: Reference to a given content (a Data_ref should be used to access a content). An access control policy is handle by references that, for instance, prevent multiple write access on the same data.

PDI::Data_descriptor: Descriptors contain all the dataset properties. Data/metadata properties that are declared in the PDI configuration file are parsed and store into PDI::Data_descriptor.

To give an example, when the application code use PDI_share to expose a data, a new Data_content that encapsulates the data buffer is produced. Then, new Data_references are sequentially generated to share the Data_content with each plug-ins. Each references are granted write/read access. Once a plug-in has received its reference, it can access to the corresponding content until the reference is destroyed. As soon as a reference is destroyed the corresponding right on the content are revoked.

2- C++11, improvement

The PDI_state was containing C arrays. Those arrays have been replaced with C++ container.

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