MERGE from REL_2_BRANCH: Bug id 20696

Workbook.getSheetIndex() needs to ignore case.
  Submitted by Eric Lander


git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@353259 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/hssf/model/Workbook.java

@@ -513,7 +513,7 @@ public class Workbook implements Model {
         for (int k = 0; k < boundsheets.size(); k++) {
             String sheet = getSheetName(k);
 
-            if (sheet.equals(name)) {
+            if (sheet.equalsIgnoreCase(name)) {
                 retval = k;
                 break;
             }