PROPOSAL: Add openFileTemplate, openBinaryFileTemplate to System.IO

[Ian Lynagh]

Hi all,

This is
    Add openFileTemplate, openBinaryFileTemplate to System.IO
    http://hackage.haskell.org/trac/ghc/ticket/3393
    (originally part of http://hackage.haskell.org/trac/ghc/ticket/2610)

In System.IO, openTempFile and openBinaryTempFile mask the file
permissions of the file they create with 0o600. However, we would like
to use it for implementing things like writeFileAtomic, in which case we
want the default file permissions to be used.

I propose that we add openFileTemplate and openBinaryFileTemplate
functions, which use the default permissions.

Deadline: 8th August (2 weeks). 


Thanks
Ian