BibIndex: centralisation of tokenizers
- Introduces tokenizers for journal, year, fulltext and authorcount indexes. Merges old tokenizing functions for pairs, phrases and words into one 'BibIndexDefaultTokenizer'. Introduces empty tokenizer. Extends admin interface to support tokenizers. (closes #852)
Signed-off-by: Grzegorz Szpura <grzegorz.szpura@cern.ch>
Tested-by: Tibor Simko <tibor.simko@cern.ch>