voteview: paired votes are recorded as not voting, not as having voted the indicated way

My Perl scraper used to treat these votes correctly as not voting. My rewrite with Gordon here changed the logic because I thought it had been wrong, but it was right.

tasks/voteview.py

@@ -204,13 +204,26 @@ def parse_icpsr_vote_string(icpsr_vote_string):
     # Probably the House used Aye and No in some votes, but we don't
     # know which. "Yea" and "Nay" are always used by the Senate, and always
     # in the House on the passage of bills.
+    # A paired vote is when two members plan to be absent in a way that
+    # does not affect the vote outcome. You can see in the Congressional
+    # record who is paired with who. Sometimes the pairings are for a
+    # particular vote, other pairings are "until further notice." The paired
+    # members are recorded as not voting. A live pair is when one half of
+    # the pair is present and withdraws their vote and votes present because
+    # the other half of the pair isn't there. Live pairs aren't recorded
+    # in this data and are treated simply as pairs (and thus for us, not
+    # voting). Some paired members are recorded simply as present in this
+    # data --- not clear why that would be.
+    # See the House vote on the Civil Rights Act of 1957 (85th Congress,
+    # Jun 18, 1957, what this data calls #42, volume 103 page 9518 of
+    # the Congressional Record) for an example of paired votes.
     icpsr_vote_code_map = {
         0: None,  # not a member
         1: ("Yea", None),
-        2: ("Yea", "paired"),
+        2: ("Not Voting", "paired-yea"),
         3: ("Not Voting", "announced-yea"),
         4: ("Not Voting", "announced-nay"),
-        5: ("Nay", "paired"),
+        5: ("Not Voting", "paired-nay"),
         6: ("Nay", None),
         7: ("Present", "type-seven"),
         8: ("Present", "type-eight"),