add function adding a number field to an alignment block given an iterator and array length
Revert "add function adding a number field to an alignment block given an iterator and array length"
this commit should have gone to the experimental branch

This reverts commit 1466686886bd9a84af407743be72ab2e087f5dc8.
Merge branch 'experimental'
Merge branch 'experimental'
Merge branch 'experimental'
Merge branch 'experimental'
Merge branch 'experimental'
add BamIndex class
fix bin sorting for BamIndex class