Changes

Add 'TestJarsInJar.jar' test JAR file for upcoming JarUtil tests (Jar in Jar).

JarUtil: Improve Robustness (Bug 522) and API doc, prepare for Jar-In-Jar. Add unit test.

Misc.:
  - IOUtil: Add toURL* methods
  - TempJarCache: Add 'URL getResource(String)'

JarUtil (Fix Bug 522): Handle case where given URL doesn't contain any '/' (eg. Eclipse 'rsrc:' case)

- Use ':' as 'path' delimiter in case no path via '/' is given.

+++

Manual tested w/ Eclipse:

Preparations:
===============

1) Set up a vanilla eclipse (3.7.0) workspace

2) Add the JOGL User Library:
  - Window.Preference
   - Java.Build_Path.User_Libraries:
     + JOGL
        + gluegen-rt.jar
        + jogl.all.jar
        + gluegen-rt-natives-linux-amd64.jar
        + jogl-all-natives-linux-amd64.jar

        You may add all other native JARs here.
        Note that these are not required in the CLASSPATH by JOGL,
        however, they are required by Eclipse to export your project as a Runnable JAR File.

3) New test project
  -  Right-click your project in the Package Explorer and click "Properties".
       - Select "Java Build Path" and click the "Libraries" tab.
          + JOGL
  - Add some simple code ..
  - Run as Java Application ..

Test-1:
=========

Export
  - Right-click your project in the Package Explorer and click "Export"
    - Select Java.Runnable_JAR_file
      + Launch configuration
      + some destination path
      + Library handling:
        Copy required libraries into a sub-folder next to the generated JAR

Result: Works!

./lala01.jar
./lala01_lib/jogl.all.jar
./lala01_lib/jogl-all-natives-linux-amd64.jar
./lala01_lib/... etc ..

Test-2:
=========

Export
  - Right-click your project in the Package Explorer and click "Export"
    - Select Java.Runnable_JAR_file
      + Launch configuration
      + some destination path
      + Library handling:
        Package required libraries into generated JAR

Result: Works!

./lala02.jar:
  Manifest-Version: 1.0
  Rsrc-Class-Path: ./ gluegen-rt-natives-linux-amd64.jar gluegen-rt.jar
                      jogl-all-natives-linux-amd64.jar jogl.all.jar
  Class-Path: .
  Rsrc-Main-Class: Test01
  Main-Class: org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader