Additional options for hashing-strategy

[meganshand]

It would be great to be able to include last modified date in the hashing-strategy when using the current path strategy. This would prevent having incorrect output from a task if the file was modified but the path was not.

[katevoss]

@geoffjentry how much effort would it be to include the last modified date in the hash?
@meganshand do you still want this feature? Or have you found a workaround?

[meganshand]

I'm still interested in this feature in the sense that it will prevent mistakes in the future, but it is not blocking any of my work. It's more of a QC feature. If it isn't easy I personally wouldn't make it a high priority.

[geoffjentry]

This has been added recently for shared file system: https://github.com/broadinstitute/cromwell/blob/90154ed22b2a78dfbb1c5342a8f0d39164aaeac8/docs/Configuring.md#local-filesystem-options