Fixes to intra_NO2_ONO_conversion family

Fix RNO2 entry in rules to match the one in groups
Fixes to 1,2-Biard_to_alkene family

Put groups into tree:
Y_12_20a
Y_12_22a
Y_12_22b
Y_12_12b
Y_12_12a
Y_12_11b
Y_12_11a
Y_12_02b
Y_12_20b
Y_12_02a
Y_12_21a
Y_12_21b