Use varying access level on version/runs methods and add tests

[Xarthisius]

This PR adds and enables tests along with other project maintenance related boilerplate. I sneaked in one minor change related to how ACLs are handled. Before most of the models were forcefully loaded and a single routine _checkAccess was called to see if a user has write access to it. Instead of doing that we now load individual objects with proper and varied access level, which is a first step towards integration with our Tale sharing functionality.

How to test?

There's not much to test here really. Optionally follow testing steps from whole-tale/ngx-dashboard#55 and see it still works

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[craig-willis]

Unrelated to this PR, but while testing it I ran into the following error:

{"message": "AttributeError: AttributeError(\"'Version' object has no attribute '_isSame'\")", "trace": [
"<FrameSummary file /girder/girder/api/rest.py, line 630 in endpointDecorator>", 
"<FrameSummary file /girder/girder/api/rest.py, line 1227 in POST>", 
"<FrameSummary file /girder/girder/api/rest.py, line 970 in handleRoute>", 
"<FrameSummary file /girder/girder/api/access.py, line 63 in wrapped>", 
"<FrameSummary file /girder/girder/api/rest.py, line 445 in wrapped>", 
"<FrameSummary file /girder/girder/api/describe.py, line 709 in wrapped>", 
"<FrameSummary file /girder/plugins/wt_versioning/server/resources/version.py, line 118 in create>", 
"<FrameSummary file /girder/plugins/wt_versioning/server/resources/version.py, line 241 in _create>",
"<FrameSummary file /girder/plugins/wt_versioning/server/resources/version.py, line 289 in snapshot>", 
"<FrameSummary file /girder/plugins/wt_versioning/server/resources/version.py, line 362 in _sameTree>"], 
"type": "internal"}

How it happened:

• Using Tale imported from Update listdirinfo wrt to recent changes in caching/listing objects girderfs#20 (contains a directory)
• Create version v1 with Force checked
• Create version v2 with Force unchecked

[Xarthisius]

Unrelated to this PR, but while testing it I ran into the following error:

How it happened:

• Using Tale imported from whole-tale/girderfs#20 (contains a directory)
• Create version v1 with Force checked
• Create version v2 with Force unchecked

Looking at this method it seems it was meant to be recursive, so _isSame -> _sameTree should fix it, but I'll let @hategan to chime in.

[hategan]

Unrelated to this PR, but while testing it I ran into the following error:
How it happened:

• Using Tale imported from whole-tale/girderfs#20 (contains a directory)
• Create version v1 with Force checked
• Create version v2 with Force unchecked

Looking at this method it seems it was meant to be recursive, so _isSame -> _sameTree should fix it, but I'll let @hategan to chime in.

Hmm, looks like I've never tested with directories in the workspace. Yes, it should be a recursive call.