nproc: A new program to count the available processors

* AUTHORS: Add my name.
* NEWS: Mention it.
* README: Likewise.
* bootstrap.conf (gnulib_modules): Add nproc.
* doc/coreutils.texi (nproc invocation): Add nproc info.
* man/Makefile.am (nproc.1): Add dependency.
* man/nproc.x: New template.
* man/.gitignore: Ignore generated man page.
* po/POTFILES.in: Add src/nproc.c.
* src/.gitignore: Exclude nproc.
* src/Makefile.am (EXTRA_PROGRAMS): Add nproc.
* src/nproc.c: New file.
* tests/Makefile.am (TESTS): Add misc/nproc-{avail,positive}.
* tests/misc/nproc-avail: New file.
* tests/misc/nproc-positive: New file.

man/.gitignore

@@ -48,6 +48,7 @@ mv.1
 nice.1
 nl.1
 nohup.1
+nproc.1
 od.1
 paste.1
 pathchk.1

man/Makefile.am

@@ -80,6 +80,7 @@ mv.1:		$(common_dep)	$(srcdir)/mv.x		../src/mv.c
 nice.1:		$(common_dep)	$(srcdir)/nice.x	../src/nice.c
 nl.1:		$(common_dep)	$(srcdir)/nl.x		../src/nl.c
 nohup.1:	$(common_dep)	$(srcdir)/nohup.x	../src/nohup.c
+nproc.1:	$(common_dep)	$(srcdir)/nproc.x	../src/nproc.c
 od.1:		$(common_dep)	$(srcdir)/od.x		../src/od.c
 paste.1:	$(common_dep)	$(srcdir)/paste.x	../src/paste.c
 pathchk.1:	$(common_dep)	$(srcdir)/pathchk.x	../src/pathchk.c

man/nproc.x

@@ -0,0 +1,4 @@
+[NAME]
+nproc \- print the number of processing units available
+[DESCRIPTION]
+.\" Add any additional description here