Fixed Windows file lock problems

[Dain Sundstrom]

I believe I have finally fixed the Windows file lock problems.  After  
extensive debugging and inspection of heap dumps, I am convinced the  
Windows file handling in the Sun VM is simply broken.  I tried a few  
of solutions, but the only one that works reliably is to copy all jar  
files to a temp location before adding them to a class loader.  This  
is the approach Tomcat takes when you enable antJARLocking in an  
application.

OpenEJB's AntiJarLocking is enabled only when running on Windows and  
only when not in embedded (test) mode.  When embedded AntiJarLocking  
is simply not needed because jars are not deleted which means there is  
no file locking problem.  AntiJarLocking can be explicitly controlled  
by setting the case-insensitive System property "antiJarLocking".   
When running non-embedded the temp files are stored in $openejb.base 
\temp, and in embedded mode they are stored in $java.io.tmpdir/OpenEJB- 
temp-RANDOM (but you shouldn't turn this on in embedded mode).

If you are on Windows, please give this a try.  I think it is critical  
to the success of this project to have flawless Windows support.

Thanks,

-dain