python -> python3, check removed files; baseline from 2.0.0

Change commands using python to python3 so I can cut-paste.

Add a check of the manifest/SOURCES file for removed files.
  Sometimes dregs are left in the working tree.

Change commands that reference previous release of software to use
2.0.0.

Author: rouilj

RELEASE.txt

@@ -44,7 +44,7 @@ Roundup release checklist:
 
     Check that metadata is valid and long descriptions is proper reST:
 
-      python setup.py check --restructuredtext --metadata --strict
+      python3 setup.py check --restructuredtext --metadata --strict
 
 6.  Clean out all *.orig, *.rej, .#* files from the source.
 
@@ -60,21 +60,21 @@ Roundup release checklist:
 
 7.  Remove previous build files
 
-      python setup.py clean --all
+      python3 setup.py clean --all
       rm -rf build/share  # deletes locale .mo files
 
     Build including new .mo files built in 6a.
 
-      python setup.py build
+      python3 setup.py build
 
     (sdist generation will fail if this isn't done)
 8.  Rebuild documentation in "share/doc/roundup/html"
 
-      python setup.py build_doc
+      python3 setup.py build_doc
 
 9.  Generate source distribution:
 
-      python setup.py sdist
+      python3 setup.py sdist
 
     (if you find sdist a little verbose, add "--quiet" to the end of the
      command)
@@ -90,14 +90,27 @@ Roundup release checklist:
     added and removed files. Last release e.g. 1.5.1 where tip is what would
     become 1.6) E.G.
 
-      hg status --rev 1.5.1:tip | sed -ne 's/^A //p' | while read i ; \
-      do echo $i; grep "$i" roundup.egg-info/SOURCES.txt; done | uniq -c
+      hg status --rev 2.0.0:tip | sed -ne 's/^A //p' | while read i ; \
+      do echo $i; grep "$i" roundup.egg-info/SOURCES.txt; done | \
+      uniq -c | sort -rn
 
     Anything with a count of 1 is not in the manifest.
     If there are missing files that should be in the manifest,
     edit MANIFEST.in to include them. For format docs see
     https://packaging.python.org/guides/using-manifest-in/#using-manifest-in
     (Note: files under website/ shouldn't be in the manifest.)
+
+10a: Check for removed files still in manifest:
+
+      hg status --rev 2.0.0:tip | sed -ne 's/^R //p' | while read i ; \
+      do echo $i; grep "$i" roundup.egg-info/SOURCES.txt; done | \
+      uniq -c | sort -n
+
+    any file with a count of 2 or more needs to be removed from
+    MANIFEST.in and possibly cleaned out of the build tree.
+
+10b: if you added/removed files rebuild starting at step 6a.
+
 11. Unpack the new tarball created in dist/roundup-<version>.tar.gz
     file in /tmp then
       a) run tests using installed pytest run under python2 and
@@ -114,7 +127,7 @@ Roundup release checklist:
     pypi account and be added as a maintainer to roundup. Ask existing
     maintainer for access. You can do this two ways:
 
-      python setup.py sdist upload --repository pypi --sign
+      python3 setup.py sdist upload --repository pypi --sign
 
     which rebuilds the source distribution tarball and uploads it.
     This means that you have uploaded something tha is not tested. It