Improve AttributeDescription: now implements Comparable, align with SDK

AttributeDescription.java:
Now implements Comparable.
Aligned methods with SDK.
Removed toOptionsString(), used toString() instead.

EntryHistorical.java, HistoricalAttributeValue.java:
Consequence of the changes to AttributeDescription

Attribute.java:
Changed hasAllOptions() parameter from Collection<String> to Set<String>.

AbstractAttribute.java:
Used static methods from AttributeDescription.
Consequence of the changes to Attribute.

VirtualAttribute.java, AttributeBuilder.java, AttributeBuilderTest.java:
Consequence of the changes to Attribute.