opkg_prepare_url_for_install: Handle force_reinstall as upgrade

The best way to handle force_reinstall is to make the reinstall look like an
upgrade - because we already have a good package upgrade path. With the new
per package force_reinstall flag this is now possible.

In opkg_prepare_url_for_install, we set the per-package force_reinstall flag for
the given package. As this function is only called for packages explicitly
specified as arguments to 'opkg install' or 'opkg_install_package', the flag
will only be applied to the indended packages.

If a package name is given which exists in a package feed then we need to cheat
a little. We lookup the package in the feed and get its local filename and then
act as if that path were given as a URL.

This function is the best place to handle the force_reinstall flag as it is
responsible for setting the package hash table up so that
pkg_hash_fetch_best_installation_candidate_by_name() returns the intended
pacakge.

The old logic in opkg_install_cmd which calls opkg_remove_cmd to remove the
previously installed package is no longer needed and is removed.

This solves issue #71 without causing a regression on issue #51.

Signed-off-by: Paul Barker <paul@paulbarker.me.uk>

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