Locate databases with relative pathnames
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1. Purpose
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Assume an nfs server SERVER exporting /SERVERPATH, and some clients using
	mount SERVER:/SERVERPATH /CLIENTPATH1
as well as some other clients using
	mount SERVER:/SERVERPATH /CLIENTPATH2
where SERVERPATH, CLIENTPATH1, and CLIENTPATH2 may all differ.

In such a situation it is desirable to (re-)build a locate database
on SERVER for the files under /SERVERPATH (for reasons of efficiency
as well as access permissions).

If that database is located under /SERVERPATH and contains only the filename
parts relative to /SERVERPATH, the locate command on the server or clients
could prepend /SERVERPATH, /CLIENTPATH1, resp. /CLIENTPATH2 to these
filename parts, thereby producing results that are correct for the
respective hosts.

2. Basic Idea
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2.0 Only implemented for new (LOCATE02) database format, since support for
the old format will be discontinued in the near(?) future.

2.1 The database format is not modified but slightly reinterpreted as
follows: The current implementation cannot contain an empty filename. Thus,
adding a dummy empty filename as first database entry can signal to locate
that a