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Use the missing defaultInstallFlags.

See http://www.opensource.org/licenses/bsd-license.php

The stability field in .cabal files is deprecated since it's mostly useless.

Using hyphens rather than upper case.

We do not know if programs are installed or not so report
unknown rather than saying it is not installed.

We can no longer expect mtl, network and parsec to be installed.

The order of the package db stack is important.

This is an old non-standard extension that some tar tools still use.

Previously only created the immediate parent directory.
No rely more heavily on the file security check to make
sure we are not writing files outside of the target area.

When checking for tarbombs, ignore PAX entry types 'g' and 'x'.
These do not get extracted so their names do not matter.

Remove local copies. Also fixes a bug recently introduced
in the writeFileAtomic function, spotted by Peter Robinson.

The new cabal init stuff needs some work.

It works by ignoring the possibility that there could be multiple
installed packages sharing the same source package Id. We just pick
the "top most" one which is usually ok. We make no attempt to check
that we are using consistent installed packages.

ghc ticket #3602

We were doing it wrong, but Linux realpath() C function was letting
us get away with it. The Solaris realpath() is stricter.
The new implementation is also simpler, relying on the fact that
the canonicalizePath function will resolve symlinks.

Needs recent api changes.

Previously the --haddock-index=template flag controled both the
template used and whether it's used at all. When no path was set
then it was not used. The problem with that is that since we are
not enabling this feature by default then the default is blank.
That is the default config file would look like:
-- haddock-index:
which doesn't help anyone discover what it means or what a
sensible setting would be. By having a separate toggle to     
enable/disable we can have a default for the index file which
makes it easy to discover in the config file:
-- documentation: False
-- doc-index-file: $datadir/doc/index.html
All the user has to do is uncomment the first line and use True.