Allow resampling of a single group

[stscijgbot-jp]

Issue JP-3764 was created on JIRA by Brett Graham:

Outlier detection uses resample "many_to_many" when resampling input images. "many_to_many" produces a resampled image for each group of input images and requires either holding all of the resampled images in memory or writing them out to disk before proceeding with outlier detection.

Refactor resample to allow resampling a single group of input images at a time to allow outlier detector to more efficiently manage memory used for resampled images.

[stscijgbot-jp]

Comment by Brett Graham on JIRA:

Feature implemented in #8782

[stscijgbot-jp]

Comment by Ned Molter on JIRA:

Fixed by #8782