indigo.createDecomposer changes R-group passed as query

Hi,

very nice project thanks for maintaining this.

when initializing the decomposer it reduces user supplied scaffold definition. For the following scaffold it reduces R2 and R3 to a single R group. Is there a way to prevent this?

```import indigo
from indigo import renderer
from IPython.display import SVG

indigo = indigo.Indigo()

def render_molobj(indigo, molobj: indigo.IndigoObject):
render = renderer.IndigoRenderer(indigo)
indigo.setOption("render-image-width", 200)
indigo.setOption("render-image-height", 200)
indigo.setOption("render-coloring", True)
indigo.setOption("render-output-format", "svg")
svg_image = render.renderToBuffer(molobj)

display(SVG(svg_image))

indol_scaffold = """
MJ200900

10 11 0 0 0 0 0 0 0 0999 V2000
0.6347 0.5113 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
1.3491 0.0988 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
1.3491 -0.7259 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
0.6347 -1.1384 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
-0.0796 -0.7259 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
-0.0796 0.0988 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0
-1.3492 -0.3135 0.0000 R# 0 0 0 0 0 0 0 0 0 0 0 0
-0.8642 0.3538 0.0000 N 0 0 0 0 0 0 0 0 0 0 0 0
-1.1191 1.1384 0.0000 R# 0 0 0 0 0 0 0 0 0 0 0 0
-0.8642 -0.9808 0.0000 R# 0 0 0 0 0 0 0 0 0 0 0 0
1 2 2 0 0 0 0
2 3 1 0 0 0 0
3 4 2 0 0 0 0
4 5 1 0 0 0 0
6 1 1 0 0 0 0
6 5 2 0 0 0 0
6 8 1 0 0 0 0
8 7 1 0 0 0 0
8 9 1 0 0 0 0
7 10 1 0 0 0 0
10 5 1 0 0 0 0
M RGP 3 7 2 9 1 10 3
M END
"""

molecules = [
indigo.loadMolecule("CN(C)CCN1C=CC2=C1C=CC=C2"),
indigo.loadMolecule("CC(CN(C)C)N1CC2=C1C=CC=C2")
]

mol_scaffold = indigo.loadQueryMolecule(indol_scaffold)
decomposer = indigo.createDecomposer(mol_scaffold)

decomposition = decomposer.decomposeMolecule(molecules[0])

for q_match in decomposition.iterateDecompositions():
decomp_item = q_match.decomposedMoleculeWithRGroups()
if decomp_item.countRSites() != 0:
render_molobj(indigo, decomp_item)
print(decomp_item.smiles())

```

PS: Do you have an example on the MoleculeRGroupsComposition code somewhere?