 FsaAccess: 
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15-09-2005 add FsaAccessBuilderRandom16 class
Implement an operation to add a word to an already built automatum.
Make some reeengineering (add class FsaAccesReader16, FsaAccessIOHandler, 
PrefixIterator) to manage code which is common to FsaAccessBuilder16,
FsaAccessSpare and FsaAccessBuilderRandom16.

