[Swift-devel] code to test for file existence in swift

[Ben Clifford]

> I wanted to add some code to my swift script that would 
> check to see if the corresponding output file existed so as not to 
> resubmit when iterating through the input files.

Restarts (at least to the extent that I have tested them, which is not in 
a huge depth) look like they work now (with recent cog and swift, after 
Mihael's changes today).

When a run fails, you will get a .rlog file for that run in pwd. You can 
restart by saying:

 $ swift -resume foo-99999.rlog foo.swift

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