Add $wgContribScoreIgnoreMinorEdits, bug fixes

A comprehensive list of changes made in this commit is provided in the
README for this fork.

README

@@ -1,2 +1,28 @@
 The Contribution Scores extension polls the wiki database to locate contributors with the highest contribution volume.
 The extension is intended to add a fun metric for contributors to see how much they are helping out.
+
+--- TEAR HERE ---
+
+This is a modified version of Extension:Contribution Scores, the original source
+code for which can be found here: https://www.mediawiki.org/wiki/Extension:Contribution_Scores
+The rest of this document discussed changes made to this copy of the extension.
+
+This fork developed by Eunakria the config option $wgContribScoreIgnoreMinorEdits,
+which is mutually exclusive with $wgContribScoreUseRoughEditCount.
+
+In addition to providing the aforementioned bug fixes, this fork also fixes two
+other unwanted behaviors exhibited by the original extension:
+
+1. When $wgContribScoreUseRoughEditCount was enabled, the extension would query
+   the user_editcount field of the user table but not actually join on the user
+   table, in the parser function {{#cscore}}. This was presumably never noticed
+   since this parser function is not frequently used.
+
+2. On some databases, there was a potential for integer underflow when
+   subtracting unsigned values in both the parser function and contribution
+   score data. This could occur if $wgContribScoreUseRoughEditCount was enabled
+   and edits went uncounted in user_editcount, and was resolved by clamping the
+   right-hand side preimage of subtraction.
+
+There are probably more bugs I don't know about, both in the original upstream
+code *and* my code! In other words, caveat emptor.