The absence of a forward slash was causing a failure when extracting a datum from dataFile

Removed annoying warning about deprecated variable. Workaround: created a new private method in PreconditionerComposed with takes only 3 arguments.

Propagating the changed name inside MapEpetra to other classes that used it. Plus, changed map_type to map_Type in every other file.

1) typedefs: should end with _Type and use uppercase for the first letter of new word, such as commPtr_Type, rather than comm_ptrtype
2) Added checks on the validity of the comm pointer before using it.
3) Construction of import/export outer pointers should be done at construction time, otherwise the trick of the double pointer does not work. Check example:

    MapEpetra map1;
    MapEpetra map2(10,0,comm);
    map1 = map2;
    const Epetra_Export& ex1 = map1.exporter();
    const Epetra_Export& ex2 = map2.exporter();

    std::cout << "&ex1 = " << &ex1 << "\n";
    std::cout << "&ex2 = " << &ex2 << "\n";

4) Binary operators + and | should not be method, but outside routines.

std:: missing before pair in /u/numer/baroli/LifeV-source/lifev/lifev/structure/solver/StructuralOperator.hpp

Adding a single source file for all the exporter types. I am going to remove the other test on the importer

Correctly split the export and import. Export also has import to check that the results are correctly printed.

Previous commits by Davide Baroli were wrong. The attempt to reset to the original settings has failed. Resetting the missing pieces.