langtools regression tests on Windows

[Jonathan Gibbons]

All,

With the recent pushes to the tl/ repository, we have completed some 
long overdue maintenance on the langtools regressions tests.

We have verified that all [*] the tests run on Windows using MKS support 
for Unix scripts, which is the JDK standard.  But, we have also upgraded 
all the shell tests so that they can now be run with Cygwin as well. 
Finally, we have upgraded our internal testing facilities so that it is 
easier to run the regression tests on Windows automatically.

-- Jon


[*] except for the few with the @ignore tag