[FIX] StringSet: fixed metafunction StringSetPosition<>
[FIX] FMIndex Finder: overloaded _findFirstIndex() to reverse the pattern
[FIX] added missing +=, -= operators to Concatenator iterators; fixed container() of rooted iterator to always return a reference; added missing operator== for rooted vs. standard iterator comparisons
Merge pull request #161 from esiragusa/fix/fmindex_finder

Fix FM-index Finder
[FIX] Packed String: fixed the overloading of _clearSpace()
Merge pull request #162 from esiragusa/fix/packed_string_assign

Fix assignment of Packed Strings
[NOP]
[FEATURE] StringSet: added Segment StringSet spec
[INTERNAL] StringSet: added Segment StringSet to the sequence header
[INTERNAL, API] Segment StringSet: added assertions, defined appendInfix()
[FEATURE] Segment StringSet: defined View<>, view()
[NOP] Index View
[INTERNAL] StringSet: moved common View and Device definitions
[INTERNAL] StringSet: moved common View and Device definitions
[INTERNAL] Multiple Finder: removed unnecessary overloads for TNeedle being String of String
[FIX] Segment StringSet: don’t clear host pointer
[FIX] Segment StringSet: fixed StringSetPosition<> for const Host
[FIX] Segment StringSet: fixed assignInfixWithLength()
[INTERNAL] Segment StringSet: overloaded _refreshStringSetLimits()
[INTERNAL] Segment StringSet: assignValue()