- major cleanup of Makefile.yp to use modern make(1) variables, and
follow our formatting convetions.
- add support for aliases, amd.home, master.passwd and netgroup maps
[initially from openbsd, reworked as above]
- if INSECURE != "yes" then the passwd.by* maps will not contain the
encrypted version of the passwd - privileged clients will request
info from the master.passwd.by* maps.
FreeBSD originally implemented this, and & OpenBSD supports it too.
[from openbsd].

By default, passwd maps are INSECURE, but in a *BSD-only environment,
this could be disabled to allow for a [slightly] higher degree of
security from non-root users...

Makefile cleanups

Format and install ypinit manual page. (PR 3139 from
Andrew Wheadon <andrew@wipux2.wifo.uni-mannheim.de>.)

Use ${INSTALL}.

Install the Makefiles with mode 0644, not ${BINMODE}

branches: 1.1.1;
Initial revision