Add parameter for reads length to lsg.
Fix interval_manager debug print and remove useless pointer to pointer.

Use DEBUG_LOG for interval_manager debug messagges.
Use >> interval_t* instead of >> interval_t**.
Add operator==, operator!= and operator= to QIntervals.
Add get_current_nucleotide function to BWTReader.
Add readsLen as a parameter of lsg.
Merge branch 'extend-arc-intervals'

Conflicts:
	src/lsg/lsg.cpp