barcode_index_builder.hpp:

- Added no TaxaTree in read means taxa '0'
- Bugfix taxatree_prefixes
- Cut out taxatree parser to vector<int>

barcode_index.hpp:
- Changed TaxIdEncoder to fully use TaxId vs int64
- small bugfixes eg: moved declarations around, corrected taxid_begin()
- made edge_to_entry in FrameBarcodeIndex public

barcode_info_extractor.hpp:
- Added GetTaxidCount

barcode_index_construction.cpp:
- Added chunk of code to determine and set LCA per EdgeEntry in barcode_index