Read/write test suite does not clean up temporary files

[fredrikbk]

After running the test suite the following temporary files are left in the file system

diffcommand.tac
diffresult
rua_32.rb.csc

Any temporary files should be created in a temporary directory retrieved from the operating system, the same way that Shoaib's C backend works. They should also be deleted.

Perhaps a good way to do this is to have the file writers write to an ostream object? This is both more flexible for a user, and also allows the the test suite to insert a listener that does not require writing the data to disk.

[Lugatod]

Fixed in db2b264