feat: stable tasks ordering + minor polishing

[blokhin]

sort tasks in yastatus outputs for more convenient comparison

[pep8speaks]

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

• In the file examples/submit_topas_input.py:

Line 31:80: E501 line too long (113 > 79 characters)

• In the file yascheduler/db.py:

Line 246:80: E501 line too long (102 > 79 characters)
Line 257:80: E501 line too long (93 > 79 characters)
Line 269:80: E501 line too long (87 > 79 characters)
Line 285:80: E501 line too long (82 > 79 characters)

[knopki]

LGTM