added exon diagrams
commented debugging print statements
added exon diagrams
fix a problem with negative strand

find_A3SS function is imported from find_A3SS.py to deal with 5' ss from a negative strand
fix a problem with negative strand

find_A5SS function is imported from find_A5SS.py to deal with 3' ss from negative strand
move import find_A3SS inside main function

placing it outside main causes recursive import of find_A3SS and find_A5SS