Makefile: split mapsplice_multi_thread rule
src/gtf2genetab.py: add licence
reimplement read_chromo_size in python
Makefile: generalise for all .py scripts
add some NOTES
Move check_index_consistency functionality into mapsplice.py.
src/read_chromo_size.py: add licence
Remove obsolete files.
Reimplement check_reads_format in C, with support for gzipped reads.