SMARTS loader load grouped components as separate molecules

[AliaksandrDziarkach]

SMARTS component-level grouping used to group dot-disconnected fragments, e.g.:
([#8].[#8]) match molecules that contain two oxygens that are within the same component ( e.g. O=O and OCCO but NOT O.CCO)

Due to bug in rsmiles_loader group loaded as separate molecules.
Next code print "incorrect" instead of "correct":

rxn1 = indigo.loadReactionSmarts("([#8:1].[#6:2])>>([#8:1][#6:2])")
if rxn1.countReactants() == 1:
    print("correct")
else:
    print("incorrect")