new optimization from John demands that bimaps are derived in the icl module.
flagged out bimap derivation in the bimap module. this module an be thrown away. added bimap derivation in modules who needed it. fusion algorithm switched on for these modules using bimaps. seems to work. compiler crashed however for dynflows main module. git-svn-id: https://svn.cs.ru.nl/repos/iTask-system/trunk@778 63da3aa8-80fd-4f01-9db8-e6ea747a3da2
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