Refactored identifiers for PDF/A Flavours.
String constants for level ids.
Changed specification class to flavour.
Changed standard member name.
Tidied toString methods.
Updated equalsVerifier version.
Replaced field refs with getters.
Interface for spec sections and ids.
Default implementation of Section.
Added basic enum test coverage.
Test cases for Section.
Renamed section test class.
Renamed section test class.
Added Junit Suites.
Corrected enum name for PDF/A-1 a.
Tweaking Section Interface methods.
Implemented new interface methods.
Added rough specification structure.
Interface and default impl for spec.
Added tests for new specification classes.