[Issue 286] Make TransformedList.isWritable abstract

[BRANDS-2]

https://glazedlists.dev.java.net/issues/show_bug.cgi?id=286



User brands changed the following:

                What    |Old value                 |New value
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        Target milestone|milestone 1               |1.8.0
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------- Additional comments from brands@... Mon Jan 26 08:57:50 +0000 2009 -------
changing milestone...

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