at least some elements should have major isotopes #1083
Description
When compiling the Groovy Cheminformatics book, I get these warnings:
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 43
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 61
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 84
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 85
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 86
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 87
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 88
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 89
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 93
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 94
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 95
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 96
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 97
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 98
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 99
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 100
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 101
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 102
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 103
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 104
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 105
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 106
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 107
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 108
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 109
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 110
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 111
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 112
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 113
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 114
org.openscience.cdk.config.IsotopeFactory ERROR: Could not find major isotope for: 115