Be more systematic about putting space before paren in calls,
and in avoiding unnecessary parentheses in macros.
This was partly inspired by my wading through gcc -E output
while debugging something else, and seeing too many parens.
This patch does not change the generated .o files on my platform.
* admin/notes/java: New file. Move most of its contents from
README, and introduce a section on compatibility.
* java/README: Move internals to admin/notes/java.
