Fix bamtag with dual UMIs
Fix bamtag with dual UMIs

bamtag uses a regex to identify the UMIs, but said regex stops at word
boundary, therefore missing the second part of the barcode (dual UMIs
are in the form UMI_XXXX_YYYY or UMI_XXXX-YYYY).

This commit adds an optional check for words past `-` or `_`.

vals/umis,vals/umis