TestConsoleMain should print stack traces for failed tests

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Current TestConsoleMain prints something like:

some test failed due to failed assertion: (no message), expected: 3, actual: 11

It is hard to find where test failed if test has many assertions declared in different methods. Need stack trace.

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Imported From: https://issues.scala-lang.org/browse/SI-141?orig=1
Reporter: @stepancheg

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@michelou said:
Fixed in rev 12973

Stack trace now appears in output; override method enableStackTrace to disable it.

class Test1 extends TestCase("Test1") {
  //override def enableStackTrace = false
  def runTest() {
    assertEquals("1: ", 3, 1)
  }
}

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@odersky said:
Milestone 2.6.1 deleted