parse-datetime: better name than get_date

* NEWS: Reword the deprecation notice.
* modules/get_date: Rename to modules/parse-datetime.
* modules/get_date-tests: Rename to modules/parse-datetime-tests.
* m4/get_date.m4: Rename to m4/parse-datetime.m4.
* lib/get_date.y: Rename to lib/parse-datetime.y.
* tests/test-get_date.c: Rename to tests/test-parse-datetime.c.
* doc/get_date.texi: Rename to doc/parse-datetime.texi.
* doc/getdate.texi: Provide fallback wrapper.
* lib/getdate.h: Move guts, and wrap...
* lib/parse-datetime.h: ...new file.
* lib/parse-datetime.y (get_date): Rename...
(parse_datetime): ...to this.
* m4/parse-datetime.m4 (gl_GET_DATE): Rename...
(gl_PARSE_DATETIME): ...to this.
* doc/posix-functions/getdate.texi (get_date): Provide fallback
documentation.
* modules/getdate (Files): Provide fallback docs and header.
(Notice, Depends-on): Update references.
* tests/test-parse-datetime.c: Likewise.
* DEPENDENCIES: Likewise.
* MODULES.html.sh (Date and time <time.h>): Likewise.
* doc/parse-datetime.texi (Date input formats)
(Authors of parse_datetime): Likewise.
* modules/parse-datetime (Files, configure.ac, Makefile.am)
(Include): Likewise.
* modules/parse-datetime-tests (Files, Makefile.am): Likewise.
* gnulib-tool: Likewise.
* m4/bison.m4 (gl_BISON): Likewise.
Suggested by Bruno Haible.

Signed-off-by: Eric Blake <eblake@redhat.com>

modules/parse-datetime

@@ -0,0 +1,52 @@
+Description:
+Convert a date/time string to linear time.
+
+Files:
+doc/parse-datetime.texi
+lib/parse-datetime.h
+lib/parse-datetime.y
+m4/bison.m4
+m4/tm_gmtoff.m4
+m4/parse-datetime.m4
+
+Depends-on:
+c-ctype
+stdbool
+gettime
+intprops
+mktime
+setenv
+unsetenv
+time
+verify
+xalloc
+
+configure.ac:
+gl_PARSE_DATETIME
+
+Makefile.am:
+# This rule overrides the Automake generated .y.c rule, to ensure that the
+# parse-datetime.c file gets generated in the source directory, not in the
+# build directory.
+parse-datetime.c: parse-datetime.y
+	$(AM_V_GEN)$(SHELL) $(YLWRAP) $(srcdir)/parse-datetime.y \
+	                              y.tab.c parse-datetime.c \
+	                              y.tab.h parse-datetime.h \
+	                              y.output parse-datetime.output \
+	                              -- $(YACC) $(YFLAGS) $(AM_YFLAGS) && \
+	mv parse-datetime.c parse-datetime.c-t && \
+	mv parse-datetime.c-t $(srcdir)/parse-datetime.c
+lib_SOURCES += parse-datetime.y
+BUILT_SOURCES += parse-datetime.c
+MOSTLYCLEANFILES += parse-datetime.c-t
+MAINTAINERCLEANFILES += parse-datetime.c
+EXTRA_DIST += parse-datetime.c
+
+Include:
+"parse-datetime.h"
+
+License:
+GPL
+
+Maintainer:
+Paul Eggert