Docstring fix and coverage_gff function...

Fixed docstring…
Started working on the coverage_gff function…
Refactoring variable and completed coverage_gff...

Forgot to refactor the l variable to q…
The coverage_gff function is complete and accepts a list or dictionary…
Refactored coverage_gff...

No need to process DictType inside the function… Only process ListType…
Calculate overall coverage...

Sum the range difference of each tuple in the coverage list…