I.4.13 A few singleton (static) methods

Four singleton methods allow to convert layers and sub-layers string/integer IDs:

• “layerStr2Int” converts a layer name to its corresponding layer integer ID.
• “layerInt2Str” converts a layer integer ID to the corresponding name (String).
• “subLayerStr2Int” converts a sub-layer name to its corresponding layer integer ID.
• “subLayerInt2Str” converts a sub-layer integer ID to the corresponding name (String).