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-kotlin/src/test/java/net/sourceforge/pmd/cpd/KotlinTokenizerTest.java

@@ -40,4 +40,9 @@ public class KotlinTokenizerTest extends CpdTextComparisonTest {
     public void testImportsIgnored() {
         doTest("imports");
     }
+
+    @Test
+    public void testTabWidth() {
+        doTest("tabWidth");
+    }
 }

pmd-kotlin/src/test/resources/net/sourceforge/pmd/lang/kotlin/cpd/testdata/tabWidth.kt

@@ -0,0 +1,5 @@
+var x = 0
+
+fun increment() {
+	x += 1
+}

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

@@ -0,0 +1,19 @@
+    [Image] or [Truncated image[            Bcol      Ecol
+L1
+    [var]                                   1         3
+    [x]                                     5         5
+    [=]                                     7         7
+    [0]                                     9         9
+L3
+    [fun]                                   1         3
+    [increment]                             5         13
+    [(]                                     14        14
+    [)]                                     15        15
+    [{]                                     17        17
+L4
+    [x]                                     2         2
+    [+=]                                    4         5
+    [1]                                     7         7
+L5
+    [}]                                     1         1
+EOF