new LRhsTransformationType to avoid

misunderstandings resulting from LhsTransformationType name (without R)
and renaming accordingly where necessary
and missing comment on u-transformation added
new ct:Variable element in ObservationModel
minOccurs fixed
minOccurs or RowIndex set to 0
need to move somewhere else
previous matrixType now deviationMatrixType

and relocated as attribute of the Correlation element
temporary comment added
minOccurs set to 0 - <Matri>x can have no children

default attributes defining the content
Matrix use limited to Correlation structure only for now