umxRAM2Lav: Convert a RAM model to a lavaan string
Description
Takes an OpenMx RAM model and creates the corresponding lavaan syntax string.
This function is at the alpha quality stage, and **should be expected to have bugs**.
Also likely to change functionality and even parameters as new features are supported (e.g. groups)
and lavaan-style strings exported. Several features are not yet supported. Let me know if you would like them.