clean up code, setup in ready-to-run state

programmer notes.txt

@@ -0,0 +1,27 @@
+[scraper rate limitations]
+50 searches/pages every 15 minutes
+	- max 20 tweets per search
+
+[possible combinations which involve a "target cross-tweeter" B]
+A retweets B
+	- B's tweet may have cross-mentions (B1, B2, etc.)
+	- rt_author_id=B; rt_mentions=B1,B2,...
+A retweets tweet mentioning B
+	- rt_author_id=...; rt_mentions=B...
+
+A quotes a tweet from B
+	- B's tweet may have cross-mentions (B1, B2, etc.)
+	- quote_retweeted=B; rt_mentions=B1,B2,...
+A quotes a tweet mentioning B
+	- quote_retweeted=...; rt_mentions=B...
+
+A replies to B
+	r = B
+A replies to a tweet mentioning B
+	- r=...; rtm=B1,B2,...
+
+-- NO --
+A retweets a tweet that quotes a tweet mentioning B?
+
+[potential code change]
+rtm --> tgm (target tweet's mentions)