. remove #if 0's and stray comments
. cleanup UnicodeSet docs (deserialize does not freeze)
. remove dead code in collationdatareader.cpp
X-SVN-Rev: 37960
* implement a deserialize constructor for UnicodeSet
* add test cases for same
* add a generator (`gencolusb`) which can build `source/i18n/collunsafe.h`
* Note that for bootstrapping `collunsafe.h` can be truncated (zero length).
X-SVN-Rev: 37929