Notes for fluentMeshToFoam with zone preservation
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1. New option added:
    - writeSets: 
    Writes all Fluent boundaries faceSets preserving Fluent names
    Writes all Fluent regions to cellSets preserving Fluent names
    lines: 1375 - 1393 & 1673 - 1741
    sets are useful for post-processing using foamToVTK with the "-faceSet
    <name>" and "-cellSet <name>" options.
    
    - writeZones: 
    Writes all regions to cellZones preserving Fluent names
    Writes all region internal face to faceZones preserving Fluent names 
    lines: 1545 - 1667
    Zones are usefull for porous media and MRF calculations

2. Zone Access
    - Zones are simple lists of label lists that can be accessed from polyMesh 
    with the cellZones(), faceZones() and pointZones() member functions

    - Example (Members from polyMesh.H and ZoneMesh.H):
    label thisCellZoneID = mesh.cellZones().findZoneID("thisZoneName");
    const labelList& thisCellZone = mesh.cellZones()[thisCellZoneID];
    
    - Zone integrity is preserved during mesh modification and decompomposition.
    
    - Once created via addZones, zones allow modification through non-const 
    access

3. Fluent boundary types.
    - All internal and baffle elements are ignored during conversion
    
    - Boundary faces labelled as internal (i.e. interior, interface, internal,
    solid, fan, radiator, porous-jump) but that are in fact external boundaries
    will be added to a default wall boundary.
