New collator for GCJ

[Guilhem Lavaux]

Hi,

I have noticed that the new classpath's RuleBasedCollator has not been 
included in GCJ. All tests of gnu.testlet.java.text.RuleBasedCollator 
are passing now. I expect the remaining failures in 
CollationElementIterator.jdk11 to vanish when the collation rules will 
be complete in locale data (currently they are caused by auto-guess 
sequence ordering).

I have attached the new collator and its iterator. The ChangeLog entry 
is quite simple: near full reimplementation.

There are still three missing features/bugs:

* '!' is not yet supported (but it should be easy to implement it as 
there is a real specification in jdk's doc).
* Implicit reverse ordering of accented characters are not clearly 
specified so the result may be random. Though for complete collation 
rules the feature is implemented.
* getMaxExpansion() only returns 1 for the moment.

Cheers,

Guilhem.
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