Change the default args list expansion extension to .args.

[cmnbroad]

Change the default extension for auto-expansion of command line args to ".args" from ".list", which was causing problems with Picard interval lists. Fixes #94.

This is a short term fix. The longer term fix is in #95.

[droazen]

👍 merge when ready

[codecov-io]

Codecov Report

Merging #111 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #111   +/-   ##
=========================================
  Coverage     75.69%   75.69%           
  Complexity      580      580           
=========================================
  Files            22       22           
  Lines          2181     2181           
  Branches        449      449           
=========================================
  Hits           1651     1651           
  Misses          351      351           
  Partials        179      179

Impacted Files	Coverage Δ	Complexity Δ
...e/barclay/argparser/CommandLineArgumentParser.java	82.35% <ø> (ø)	176 <0> (ø)	⬇️

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