Add a new method getBestIdentifier to the ITopic Interface

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Reported by michael.prilop @tmql4J

We need a fn:best-identifier which delivers a stable identifier for a given 
topic.

best-identifier should be in following ordering a
1. subject identifier (si)
2. subject locator (sl)
3. item identifier (ii)
if several identifier of the same type are present the shortest should be 
choosen (e.g. there are two si -> choose shortes si regardless of sl or ii).
The returned identifier should be prefixed with its type e.g.
si:http://example.com/something

see: 

http://code.google.com/p/tmql/issues/detail?id=25

Original issue reported on code.google.com by Sven.Kro...@googlemail.com on 13 Jan 2011 at 8:45

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Original comment by Sven.Kro...@googlemail.com on 13 Jan 2011 at 8:45

• Changed state: Started

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Original comment by Sven.Kro...@googlemail.com on 13 Jan 2011 at 9:12

• Changed state: Fixed