[Enhancement]: bg_disp (now called bg_row_by_row), bg_dir, and isrotate all seem to control the same thing

[taylorbell57]

This seems problematic. I'll need to look into this

Originally posted by @kevin218 in #632 (comment)

[taylorbell57]

@kevin218, this may be worth addressing before v1.0 since it could result in some meaningful changes to ECF parameters

[kevin218]

@taylorbell57 After a few tests, I've managed to simplify the code so that bg_dir and isrotate do not need to be specified in s3_meta.py.