patman: Support listing comments from patchwork

While reviewing feedback it is helpful to see the review comments on the
command line to check that each has been addressed. Add an option to
support that.

Update the workflow documentation to describe the new features.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/patman/patchstream.py b/tools/patman/patchstream.py
index c165bc1..772e4b5 100644
--- a/tools/patman/patchstream.py
+++ b/tools/patman/patchstream.py
@@ -89,11 +89,12 @@
         self.blank_count = 0             # Number of blank lines stored up
         self.state = STATE_MSG_HEADER    # What state are we in?
         self.commit = None               # Current commit
-        self.snippets = []               # List of unquoted test blocks
+        # List of unquoted test blocks, each a list of str lines
+        self.snippets = []
         self.cur_diff = None             # Last 'diff' line seen (str)
         self.cur_line = None             # Last context (@@) line seen (str)
-        self.recent_diff= None           # 'diff' line for current snippet (str)
-        self.recent_line= None           # '@@' line for current snippet (str)
+        self.recent_diff = None          # 'diff' line for current snippet (str)
+        self.recent_line = None          # '@@' line for current snippet (str)
         self.recent_quoted = collections.deque([], 5)
         self.recent_unquoted = queue.Queue()
         self.was_quoted = None