Undoing some much too hacky code to implement a...

Undoing some much too hacky code to implement a -jar option and then
following wherever that led me. Tangible results include:

 * much beautified scala -help, including documenting some things
   never before documented in this plane of existence
 * an improved Jar abstraction
 * further systemization of system properties

In addition, the jars created by -savecompiled are given the right
manifest so the jar is runnable. That means you can:

  scala -savecompiled bippy.scala arg1 arg2
  scala -jar bippy.scala.jar arg1 arg2

And both lines should yield the same result. No review.

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