fastjar binary renamed to jar

[Per Bothner]

I renamed the "fastjar" binary to "jar", in both the trunk and the branch.

Of course this only changes the name of the executable; the name
of the directory and package will remain "fastjar".
-- 
	--Per Bothner
per@bothner.com   http://www.bothner.com/per/