changed signature and error management of CreateLayers()
small optimisations to CreateLayers() method
optimised LayerMapping() method
fixed issue with input file selection for raster files

fixed another file open issue
changed signature of blend method
reduced indentation
renamed MshLayerMapper to MeshLayerMapper and moved it to MeshLib
removed redundant preprocesser flags
added std namespace
Merge pull request #389 from rinkk/MeshLayerMapperRework

MeshLayerMapper revision