Ensure CPD uses tab width of 1 for tabs consistently

The columns that are reported by CPD were inconsistent across languages
before. A language like Java (using a JavaCC-based tokenizer) would use
a width of 8 for tabs, whereas a language like C# (using an Antlr-based
tokenizer) would use 1 instead.

This includes unit tests for most languages to ensure a tab character is
counted as 1. The configuration for JavaCC has been adjusted to respect
this as well.

pmd-dart/src/test/java/net/sourceforge/pmd/cpd/DartTokenizerTest.java

@@ -82,4 +82,9 @@ public class DartTokenizerTest extends CpdTextComparisonTest {
         doTest("string_multiline");
     }
 
+    @Test
+    public void testTabWidth() {
+        doTest("tabWidth");
+    }
+
 }

pmd-dart/src/test/resources/net/sourceforge/pmd/cpd/testdata/tabWidth.dart

@@ -0,0 +1,3 @@
+class MyClass {
+	var s1 = 'test';
+}

pmd-dart/src/test/resources/net/sourceforge/pmd/cpd/testdata/tabWidth.txt

@@ -0,0 +1,13 @@
+    [Image] or [Truncated image[            Bcol      Ecol
+L1
+    [class]                                 1         5
+    [MyClass]                               7         13
+    [{]                                     15        15
+L2
+    [var]                                   2         4
+    [s1]                                    6         7
+    [=]                                     9         9
+    ['test']                                11        16
+L3
+    [}]                                     1         1
+EOF