Create SQLite regions database, add strand and type fields to region_t
All functions of region_table ported from cp_hashtable to sqlite3, except for: insert_regions, remove_region and get_chromosome
region_table: Inserting regions now updated the hashtable of chunks info, new function creates indexes and saves chunk info into the DB
region_table: get_chromosome function uses sqlite3 instead of cp_hashtable
region_table: Functions for removal using sqlite instead of cp_hashtable
Test of region_t structures included in compilation
region table testing: Creating the table and inserting one region
region table testing: Inserting several regions
region table testing: Searching regions
region table testing: Removing regions
Basic integration with GFF and BED parsers
Optimized for working with GFF and BED parsers