Fix hgvs/free text dup/del end range positions

[korikuzma]

From 2021, we had this logic:

Dup/Dels of this form (a_b)_(c_d)  # where a,b,c,d are ints
  Use definite ranges 
    start = (min=a-1, max=b-1) 
    end = (min=c+1, max=d+1) 

However, we should fix to:

Then this is a standard residue -> interresidue conversion:
(a_b)_(c_d)-> start: models.Range([a-1, b-1]), end: models.Range([c,d])

[github-actions[bot]]

Closed by #525.