Updated contrib/vim/patchreview.* to version 0.2.1
1) adds a :DiffReview command to review code changes
in the current workspace.
2) removes the need to have patchutils (specifically filterdiff)
installed on the system by implementing patch extraction in
pure vim script.
#!/bin/sh
mkdir t
cd t
hg init
echo a > a
hg add a
hg commit -m test -d "1000000 0"
hg history
hg manifest --debug
hg cat a
hg verify