KMajorityLib/include/KMajority.h
KMajorityLib/src/KMajority.cpp
* In function used for creating a NN Index, removed unnecessary
parameter since it can be derived from template.

VocabBuildDB/VocabBuildDB.cpp
* Added nn index as program argument.
* Deleted conditioning upon normalization.
* Building and saving nn index.
* Restricted weighting to be only TFIDF or TF.

VocabLib/include/VocabDB.hpp
* Added NN index as attribute of the approximate k-majority DB class,
and added methods to build, save and load it.

VocabLib/src/VocabDB.cpp
* Changed tree for vocabulary in output status messages.
* In load BoF model method of AKMajDB class, initializing NN index.
* Implemented newly added methods.

VocabLib/tests/VocabDB_test.cpp
* Invoking new AKMajdDB methods in the method for testing that class.

VocabMatch/VocabMatch.cpp
* Fixed bug, wrong initialization of scoring argument.
* Added nn index as program argument, using it to load nn index in case
of the vocabulary happens to be of type AKMaj.