Variable number of banks for loading

[marshallmcdonnell]

Need to allow for a variable number of banks to be loaded into the Bragg tab.

Example:

NOMAD: 6 banks
POWGEN: 1 banks

Also, may start producing more banks for POWGEN and NOMAD based on grouping.

[marshallmcdonnell]

Example for POWGEN that breaks

In the screenshot below, the file /SNS/PG3/IPTS-2767/shared/2018_calibration/PG3_40265.gsa was to be loaded:

Yet, we get the following error:

Traceback (most recent call last):
  File "/SNS/users/j35/git/addie_dev/scripts/addie", line 885, in do_load_bragg_file
    vec_x, vec_y, vec_e = self._myController.get_bragg_data(gss_group_name, bank_id, self._currBraggXUnit)
  File "/SNS/users/j35/git/addie_dev/addie/addiedriver.py", line 264, in get_bragg_data
    assert ws_name in self._braggDataDict[ws_group_name][1], error_message
AssertionError: Bank 1 is not found in group PG3_40265_group. Available bank IDs are ['PG3_40265'].

@wdzhou do you have access to that data? If not, let me know and I can make a working example for NOMAD if it helps (or just use VULCAN data?)