beambeam methods

[pep8speaks]

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

• In the file pysixtrack/particles.py:

Line 368:1: W293 blank line contains whitespace Line 370:13: E127 continuation line over-indented for visual indent Line 372:1: W293 blank line contains whitespace Line 379:1: W391 blank line at end of file

• In the file pysixtrack/track.py:

Line 231:45: E202 whitespace before ')' Line 282:47: E231 missing whitespace after ',' Line 282:50: E231 missing whitespace after ',' Line 282:53: E231 missing whitespace after ',' Line 282:56: E231 missing whitespace after ',' Line 282:59: E231 missing whitespace after ',' Line 283:13: E128 continuation line under-indented for visual indent Line 299:1: W293 blank line contains whitespace Line 319:1: W293 blank line contains whitespace Line 335:13: E128 continuation line under-indented for visual indent Line 335:55: W291 trailing whitespace Line 336:13: E128 continuation line under-indented for visual indent Line 342:1: W293 blank line contains whitespace Line 353:1: W293 blank line contains whitespace Line 355:1: W293 blank line contains whitespace Line 374:1: W293 blank line contains whitespace Line 376:1: W293 blank line contains whitespace