We will soon be adding a new SCMTool implementation to Power Pack to connect to

HCL VersionVault and IBM ClearCase, supplanting the old community-driven

ClearCase support. This change adds RBTools-side support for this.
This is based on code delivered to us in partnership with HCL, but has had

significant changes. The largest change is that instead of having a completely

separate SCMClient implementation in RBTools, this is built into the same

ClearCase client. Most of the code paths are the same between the two types of

backends, and the major difference is that the diff output for VersionVault

includes additional information in the headers (the VOB OID for each changed

element, and a JSON-encoded blob to drop into the FileDiff's extra_data in order

to do better post-processing on the diff display).
There's still more to do for unit testing but functionality should be

relatively complete at this point.

Posted changes from the current checkout (rbt post with no args) including

  new, modified, deleted, renamed, and binary files.
Posted changes that spanned multiple VOBs.
Posted a change that spanned multiple VOBs, including one that was not

  configured as part of the server-side repository. Saw expected

  warning.
Posted changes for UCM activities for both a single and multiple

  revisions.
Ran unit tests.