Fix a few complaints in python/convertrules.py (issue 583290043 by address@hidden)

[jonas . hahnfeld]

https://codereview.appspot.com/583290043/diff/557180043/python/convertrules.py
File python/convertrules.py (right):

https://codereview.appspot.com/583290043/diff/557180043/python/convertrules.py#newcode1774
python/convertrules.py:1774: str += "'" * (o + 1)
I agree that this is equivalent, but still very confusing. I would
propose the following which should highlight the intent:
o += 1
if o < 0:
    str += ',' * (-o)
elif o > 0:
    str += "'" * o

https://codereview.appspot.com/583290043/diff/557180043/python/convertrules.py#newcode3973
python/convertrules.py:3973: if re.search (r"#(banter|jazz)-chordnames",
str):
Is the change from "chord-names" to "chordnames" intentional?

https://codereview.appspot.com/583290043/