Modify function FindExtensions
- Return called SNPs instead of putting them in parameters
- Adapt to changes in distance and traceback functions
Modify distance and traceback functions:
- Return SNPs instead of putting them in parameters.
- Efficient memory usage: make new variables to store SNPs (as slices of slices of bytes), copy SNP content from reads to them and then return them.
Fix the bug of reading files (breaking instead of returning as reaching EOF)
Use modified function FindExtensions in function FindSNPCall.
Merge branch 'master' of github.com:namsyvo/ISC
Fix conflict

Conflicts:
	callsnp.go