[FIX] Fixing warning in mason_variator.cpp.
Merge pull request #242 from holtgrewe/fix/mason_variator_warning

[FIX] Fixing warning in mason_variator.cpp.
[FIX] added swap for iterator proxy which typically is passed as a const-ref (this case wasn't covered by std::swap)
[FIX] added index test for packed strings
[FIX] unhided Rooted iterator of packed string
[FIX] once for all fixed CompareType<> for proxies
[FIX] added a generic assign() and operator= for StringSet
[FIX] enhanced index cross-compare test to compare the same index with different string types
[FIX] added assign, operator==, operator!= for StringSets
[FIX] fixed copy c’tors for string set
[FIX] revert to old behavior of Owner-StringSet’s appendValue()
[FIX] fixed uninitialized warning
[FIX] fixed uninitialized warning (cont’d)
Merge pull request #244 from weese/feature/fix-packed-string-swap

[FIX] fixed packed string indices and swap() for deref'ed packed string iterators
[FIX] Packed String: overloaded open() and save()
Merge pull request #245 from esiragusa/feature/packed_open_save

Overloaded open() and save() for Packed Strings
Start writing tests for the gapped Index
Tests on the Finder interface for the gapped index
BugFix in the finder interface for GenericShapes
Finished Tests: Finder<Index<…, IndexSa<Gapped<…> > > >
Prepare simple test for the gapped index strew interface