Building/testing modifies source tree

[chaosphere2112]

The following files are created in the source tree when building/testing UVCDAT:

installation/install.py
testing/cdms2/junk.xml
testing/dv3d/.baseline_path

I'm not sure what the purpose of the first two are, but the third contains a path to the baseline directory for the dv3d tests. I had added a mechanism to properly pass that path into dv3d via an argument[1], but it appears @ThomasMaxwell reverted my change at some point. This should be cleaned up -- Source clutter with build-dependent info will cause issues when multiple builds reference the same source tree.

[1] CDAT/cdat@65d545a#diff-d3e8161439180f671ad7a70585da5cc3

Migrated from: CDAT/cdat#1364

[dnadeau4]

@doutriaux1 This is more a vcs issue. The cdsm2 file junk.xml is being deleted.