import elemets, and refactor dbr to dbe,

• TODO search for "double bound equivalence" in lx1 and compare to lx1 mfql_tools _cal_dbr Hey, maybe I have an idea why we have problems with the correct annotations of double bonds for deuterated internal standards deuterium is not defined in the dbr but has to be included in some way LX 1.0 handles it, so maybe you can check the dbr code there as per OK So your dbr will report 3.5 but LX1.0 (MS tools) will report 1.5