BPackageInfoSet::Iterator: Fix NULL pointer dereference

Since the BPackageInfoSet's map is created lazily, it can be NULL when
an Iterator is constructed.

BPackageInfoSet: Add copy constructor, assignment operator

* Implement copy-on-write support.
* Add copy constructor and assignment operator.
* Remove Init(). Initialize lazily instead. Since AddInfo() can fail
and we check initialization anyway, there's no point in having an
explicit Init(). Given that there was only one invocation of Init()
in the package kit and its users, it was very likely missing in some
places.
* Fix a few places where we ignored that the PackageMap actually
contains lists of PackageInfo objects.

Pull class BPackageInfoSet out of BRepositoryCache

Pull class BPackageInfoSet out of BRepositoryCache

BPackageInfoSet::Iterator: Fix NULL pointer dereference

Since the BPackageInfoSet's map is created lazily, it can be NULL when
an Iterator is constructed.

BPackageInfoSet: Add copy constructor, assignment operator

* Implement copy-on-write support.
* Add copy constructor and assignment operator.
* Remove Init(). Initialize lazily instead. Since AddInfo() can fail
and we check initialization anyway, there's no point in having an
explicit Init(). Given that there was only one invocation of Init()
in the package kit and its users, it was very likely missing in some
places.
* Fix a few places where we ignored that the PackageMap actually
contains lists of PackageInfo objects.

Pull class BPackageInfoSet out of BRepositoryCache

Pull class BPackageInfoSet out of BRepositoryCache