[m-rev.] for review: always-in-cur-dir group of extensions

[Zoltan Somogyi]

I have earlier mentioned the idea of grouping extensions
by the algorithm we use to decide in which directory
their files ought to end up in. This diff implements this idea
for one group of extensions. If no-one objects to either the idea
or to the naming scheme that this diff adopts, then I will
apply the idea to the rest of the groups, Eventually I intend
to then factor out the decide-what-directory-to-put-stuff-in code
wherever that is possible. But before that is done, we should
consider what extensions should have their treatment modified.
I will post proposals for that in the next few days.

Zoltan.
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