The build process for 'reactive-banana-wx' has now been adapted to use 'cabal sandbox'.

Depend on reactive-banana == 0.8.*
The 'changes' function has returned to make 'reactive-banana-wx' compile again.

Some tests work, but many uses in 'reactive-banana-wx' still throw runtime errors due to insufficient laziness.
The 'Vault' for pulse values is now lazy, 'Data.Vault.Lazy'.

Many example from 'reactive-banana-wx' now work as advertised.
The 'TicTacToe' example now avoids the incorrect use of 'changes'.

Update TODO list.
'TODO' list now reflects that the implementation of the 'changes' function is complete.