packages: Install development manpages in the -dev packageHEADmain

Add a new per-group SUBPACKAGE option to bsd.man.mk.  When MANSPLITPKG
is enabled, this is forced to "-man", otherwise it defaults to empty
but can be overridden by the caller.

Use this in bsd.lib.mk to install library manpages in the -dev package
instead of the base package.  This is nearly always preferable, since
library manpages are usually in section 2 or 3 and are only relevant
to people with development packages installed.

For manpages which should be installed in the base package even for
libraries, add a new MANNODEV group in bsd.lib.mk.  Update existing
Makefiles to use this where appropriate.

MFC after:	3 days
Discussed with:	olce
Reviewed by:	olce
Sponsored by:	https://www.patreon.com/bsdivy
Differential Revision:	https://reviews.freebsd.org/D52832

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