Determine whether we're starting a list of Roman numerals

Per #1. This is a lazy solution, but it's also very achievable, so it
has that going for it.

subsection-identifier.php

@@ -105,6 +105,25 @@ function parse()
  {
  continue;
  }
+
+ /*
+ * If the section fragment is a Roman numeral "i", but the matched prefix candidate
+ * is alphabetic, then let's skip this prefix candidate and continue to iterate,
+ * knowing that we'll get to the Roman numeral prefix candidate soon. We ignore the
+ * last character, since that could potentially be the first character of the text
+ * (as opposed to the prefix), and is definitely not the text of our prefix (it
+ * could be a containing parenthesis, but we're not concerned about that now). We're
+ * trying to avoid actually matching an "i" if the text is, for example:
+ *
+ * "a. in the meaning of..."
+ */
+ if (strpos(substr($section_fragment, 0, -2), 'i'))
+ {
+ if ($prefix_members[0] == 'a')
+ {
+ continue;
+ }
+ }
 
  /*
  * Great, we've successfully made a match -- we now know that this is the beginning