Note the PDB ID on error.
Work on issue #81: Made CathDomain implement StructureIdentifier.
Finished SubstructureIdentifier and made Identifier.loadIdentifier
static (as it should have been).
Merge branch 'master' of https://github.com/biojava/biojava
Small improvements and bug fixes for issue #81.
Added guessOrderFromAngle to RotationAxis.
Moved CeSymm and some related classes to biojava-structure.
Didn't mean to push previous commit to main.

This reverts commit da1522e6e230efe999a613c1d42faff36bae24ea.
The DecimalFormats d3 and d2 are one digit too short. This has the
effect the first digit or sign of atom coordinates, occupancy, and
temperature factor are cutoff when using the toPDB method.
Merge branch 'master' of https://github.com/biojava/biojava
made method public