Move phpunit configuration to base directory.

Author: yunosh

package.xml

@@ -1033,7 +1033,6 @@
      <file name="AllTests.php" role="test" />
      <file name="Autoload.php" role="test" />
      <file name="bootstrap.php" role="test" />
-     <file name="phpunit.xml" role="test" />
     </dir> <!-- /test/Imp -->
    </dir> <!-- /test -->
    <dir name="themes">
@@ -2114,7 +2113,6 @@
    <install as="Imp/AllTests.php" name="test/Imp/AllTests.php" />
    <install as="Imp/Autoload.php" name="test/Imp/Autoload.php" />
    <install as="Imp/bootstrap.php" name="test/Imp/bootstrap.php" />
-   <install as="Imp/phpunit.xml" name="test/Imp/phpunit.xml" />
    <install as="Imp/fixtures/test.eml" name="test/Imp/fixtures/test.eml" />
    <install as="Imp/fixtures/test.mbox" name="test/Imp/fixtures/test.mbox" />
    <install as="Imp/Stub/HtmlViewer.php" name="test/Imp/Stub/HtmlViewer.php" />

phpunit.xml.dist

@@ -0,0 +1,12 @@
+<phpunit bootstrap="test/Imp/bootstrap.php" colors="true">
+  <testsuites>
+    <testsuite>
+      <directory>test</directory>
+    </testsuite>
+  </testsuites>
+  <filter>
+    <whitelist>
+      <directory suffix=".php">lib</directory>
+    </whitelist>
+  </filter>
+</phpunit>