Add extra file for data structure

The structs bibElement and bibEntry are now defined in DataStructure and
removed from Bibliography. First step towards a more flexible parser.
Begin moving parser from Bibliography to Parser
Added header files
Restructuring program

Parser goes into extra files
Repaired header file
Finished outsourcing old parser
Fixes problems for fields surrounded by quotation marks

The parser now correctly parses fields witch are surrounded by quotation
marks and contain comma in the field value.
Removed global using instructions
Merge branch 'spirit_parser'

Conflicts:
	src/bibf.hpp