ClearCase directory diffs from post-review side
ClearCase directory diffs from post-review side

Patch from Jan Koprowski. This patch add support for ClearCase directory
revisions. This is diff between "ls -1" command for each of them.

Fixes bug 1626.

clach04/rbtools_0.4.1,halvorlu/rbtools,datjwu/rbtools,haosdent/rbtools,reviewboard/rbtools,beol/rbtools,bcelary/rbtools,1tush/rbtools,reviewboard/rbtools,halvorlu/rbtools,davidt/rbtools,datjwu/rbtools,beol/rbtools,clach04/old_rbtools_0.3.2,reviewboard/rbtools,Khan/rbtools,Khan/rbtools,halvorlu/rbtools,beol/rbtools,datjwu/rbtools,clach04/rbtools,davidt/rbtools,davidt/rbtools,haosdent/rbtools,haosdent/rbtools