spacify the paper size for PostScript

Rework how dependency generation is performed:

* DPSRCS contains extra dependencies, but is _NOT_ added to CLEANFILES.
This is a change of behaviour. If a Makefile wants the clean semantics
it must specifically append to CLEANFILES.
Resolves PR toolchain/5204.

* To recap: .d (depend) files are generated for all files in SRCS and DPSRCS
that have a suffix of: .c .m .s .S .C .cc .cpp .cxx

* If YHEADER is set, automatically add the .y->.h to DPSRCS & CLEANFILES

* Ensure that ${OBJS} ${POBJS} ${LOBJS} ${SOBJS} *.d depend upon ${DPSRCS}

* Deprecate the (short lived) DEPENDSRCS


Update the various Makefiles to these new semantics; generally either
adding to CLEANFILES (because DPSRCS doesn't do that anymore), or replacing
specific .o dependencies with DPSRCS entries.

Tested with "make -j 8 distribution" and "make distribution".

Use ${DEPENDSRCS} as a target instead of .depend, now that
<bsd.dep.mk> builds .depend from .dep files.

Rename a large chunk of the make(1) variables which refer to a
program/tool from "FOO" to "TOOL_FOO". The new variables are:
TOOL_ASN1_COMPILE TOOL_CAP_MKDB TOOL_CAT TOOL_CKSUM TOOL_COMPILE_ET
TOOL_CONFIG TOOL_CRUNCHGEN TOOL_CTAGS TOOL_DB TOOL_EQN TOOL_FGEN
TOOL_GENCAT TOOL_GROFF TOOL_HEXDUMP TOOL_INDXBIB TOOL_INSTALLBOOT
TOOL_INSTALL_INFO TOOL_M4 TOOL_MAKEFS TOOL_MAKEINFO TOOL_MAKEWHATIS
TOOL_MDSETIMAGE TOOL_MENUC TOOL_MKCSMAPPER TOOL_MKESDB
TOOL_MKLOCALE TOOL_MKMAGIC TOOL_MKTEMP TOOL_MSGC TOOL_MTREE
TOOL_PAX TOOL_PIC TOOL_PREPMKBOOTIMAGE TOOL_PWD_MKDB TOOL_REFER
TOOL_ROFF_ASCII TOOL_ROFF_DVI TOOL_ROFF_HTML TOOL_ROFF_PS
TOOL_ROFF_RAW TOOL_RPCGEN TOOL_SOELIM TOOL_SUNLABEL TOOL_TBL
TOOL_UUDECODE TOOL_VGRIND TOOL_ZIC

For each, provide default in <bsd.sys.mk> of the form:
TOOL_FOO?= foo
and for the ${USETOOLS}=="yes" case in <bsd.own.mk>, provide override:
TOOL_FOO= ${TOOLDIR}/bin/${_TOOL_PREFIX}foo

Document all of these in bsd.README.

This cleans up a chunk of potential (and actual) namespace collision
within our build infrastructure, as well as improves consistency in
the share/mk documentation and provision of appropriate defaults for
each of these variables.

Make this work with obj dirs.

Add a Makefile, as suggested by hubertf. The Makefile cribs brazenly from^W^W^W
is heavily influenced by src/distrib/notes/Makefile.inc, from Ross Harvey.

While here, fix a typo and nuke some trailing spaces, to make mdoc more comfortable.

Change wording of note explaining that SCCS (part of the xcu5 DEVELOPER option)
is not provided by NetBSD.

Note that CSSC is in pkgsrc, and that CVS, as with RCS is now part of the base
system, not of pkgsrc.

Remove the text that GNU ar assumes files are object files. GNU ar is
perfectly happy with non-object files (they are of type "binary" and are
not scanned for ranlib symbols).

Also add some entries for false, true, bg, fg. More to come....

Minor change to at(1) description. Time to get back to work on this.

Add stub entries for all remaining commands and utilities. Now back to
the real work!

Remove .Tn from lower case name. `.Tn X/Open' will DTWT.

Add a Makefile, as suggested by hubertf. The Makefile cribs brazenly from^W^W^W
is heavily influenced by src/distrib/notes/Makefile.inc, from Ross Harvey.

While here, fix a typo and nuke some trailing spaces, to make mdoc more comfortable.

Add an appropriate copyright statement. This will be assigned to TNF
shortly.

Add stub entries for a bunch more utilities.

branches: 1.1.1;
Initial revision