Remove TIPP.getSectionObjects(), replace with getSection(type)
Make PackageStore not explicit in TIPPFactory.

    PackageStoreFactory is a factory that is set in the TIPPFactory.
    Stores are no longer passed explicitly to factory.  Factory methods
    are no longer static.
Remove deprecated methods
Testcase to ensure TIPPFile falls back to location if there's no name
Failing unittest for sequence ordering in sections
Clean up section/resource/file sequencing issues
Remove unused simple.xml testcase
Remove dead code
TIPPSection.getResources() now returns List<? extends TIPPResource>

    This is a little ugly but lets us handle the TIPPReferenceSection
    overrides better.
    TIPPReferenceSection can now only contain ReferenceFile instances.
de-TIPPResource-ify most public methods

    The base class still exists internally, but as there's no non-file
    resource type right now, TIPPSection.getResources() now returns
    List<TIPPFile> instead.

    XML serialization for resources has been split out to the individual
    classes.  This cleans up a little bit of ManifestDOMBuilder.
Factor out more XML serialization logic into the representation classes
Misc cleanup
Allow files to be added to sections with a specific sequence number
Improved sequence number handling (duplicate detection) within a section
Remove explicit store parameters from remaining TIPPFactory methods
Implement name->location normalization
Add unittest to verify that zip64 TIPPs can be opened