Dev refactor aria dl

[alexfore]

Test bot

[pep8speaks]

Hello @alexfore! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file tools/bin/ariaDownload.py:

Line 36:80: E501 line too long (80 > 79 characters)
Line 37:22: E131 continuation line unaligned for hanging indent
Line 41:80: E501 line too long (89 > 79 characters)
Line 318:9: E266 too many leading '#' for block comment
Line 318:9: E303 too many blank lines (2)
Line 320:12: E221 multiple spaces before operator
Line 324:29: E127 continuation line over-indented for visual indent
Line 325:29: E127 continuation line over-indented for visual indent
Line 326:29: E127 continuation line over-indented for visual indent
Line 327:29: E127 continuation line over-indented for visual indent
Line 328:29: E127 continuation line over-indented for visual indent
Line 329:29: E127 continuation line over-indented for visual indent
Line 330:13: E124 closing bracket does not match visual indentation
Line 331:29: E116 unexpected indentation (comment)
Line 338:13: E266 too many leading '#' for block comment
Line 351:27: E225 missing whitespace around operator