Issue #474:
First implementation of VTK exporter:
- Exportation works for scalar/vector data exported per node or per element
- Faces exportation is not yet implemented
- File organization will be reworked
Issue #474:
- Removed use of missing static function
add is_a_matrix (equivalent to is_a<matrix>) in ginac contrib : avoid a crash due to a dynamic_cast with macport/clang (I don't understand why but it's work if dynamic_cast is done in ginac src and not in feel src
up ginac (avoid crash with dynamic_cast ):
 - replace is_a<lst>(e) by e.info(info_flags::list) : equivalent -> see ginac doc
 - replace is_a<matrix> by is_a_matrix
minor up
Issue #474:
- Cmake:
* Added LibXml2 libs for compilation (the package was already looked
 for, but the libs were not added)
* Check for the parallel components to be present with VTK and set a
 flag accordingly
- Source:
* Restricted the use of MPI code to VTK >= 6: reduces code complexity
* Added pvd file to directly load all the timesteps
* Cleaned up code and
Merge branch 'develop' of https://github.com/feelpp/feelpp into develop
Issue #474
- Fix LibXml2 include directory
Issue #474:
- Moved parallel headers
Issue #474:
- Fix missing headers
- Deactivated VTK exporter by default
- Updated PVD timeset code
add // info in datamap
up datamap build
fix interpolation operator in // (related mesh case) : thanks to test_submesh
fix test_backend
fix compilation warning
Issue #474:
- Fix macro names
- Fix VTK 6 support
Merge branch 'develop' of https://github.com/feelpp/feelpp into develop
fix warning compilation in testsuite
Issue #474:
- Warn the user at cmake step when parallel component is not built with
  VTK
Merge branch 'develop' of https://github.com/feelpp/feelpp into develop