Some cleanup and int test improvements (#226)

Added support for large files through the `cadcutils` package. Some cleanup and bug fixes.

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Co-authored-by: Adrian Damian <[email protected]>

Author: andamian

vos/setup.cfg

@@ -52,11 +52,11 @@ edit_on_github = False
 github_project = opencadc/vostools
 install_requires =
     html2text>=2016.5.29
-    cadcutils>=1.5.1
+    cadcutils>=1.5.2.2
     aenum
 
 # version should be PEP440 compatible (http://www.python.org/dev/peps/pep-0440)
-version = 3.6
+version = 3.6.1
 
 [options.extras_require]
 test =