Add concurrency options and handle retries #125
Merged
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This adds new functionality for controlling the overall concurrency and bumps the default concurrency to a more sane value (1 -> 20). This also fixes an error where some manifests would fail to delete because they reference another image later. This fixes the error by introducing a retry mechanism for manifests that fail to delete with a dangling parent error (3 attempts).
Fixes #118
Closes #124