build: complete the rename of get_date

* gnulib: Update to latest.
* src/date.c (includes, batch_convert, main): Track rename.
* src/touch.c (includes, get_reldate): Likewise.
* doc/coreutils.texi (Top, Date input formats): Likewise.
* bootstrap.conf (gnulib_modules): Likewise.
* doc/Makefile.am (EXTRA_DIST): Likewise.
* doc/.gitignore: Likewise.
* bootstrap: Synchronize from upstream.

doc/.gitignore

@@ -19,5 +19,6 @@ fdl.texi
 gendocs_template
 get_date.texi
 getdate.texi
+parse-datetime.texi
 stamp-vti
 version.texi

doc/Makefile.am

@@ -17,7 +17,7 @@
 
 info_TEXINFOS = coreutils.texi
 
-EXTRA_DIST = perm.texi get_date.texi constants.texi fdl.texi
+EXTRA_DIST = perm.texi parse-datetime.texi constants.texi fdl.texi
 
 # The following is necessary if the package name is 8 characters or longer.
 # If the info documentation would be split into 10 or more separate files,

doc/coreutils.texi

@@ -474,7 +474,7 @@ Date input formats
 * Pure numbers in date strings:: 19931219, 1440
 * Seconds since the Epoch::      @@1078100502
 * Specifying time zone rules::   TZ="America/New_York", TZ="UTC0"
-* Authors of get_date::          Bellovin, Eggert, Salz, Berets, et al
+* Authors of parse_datetime::    Bellovin, Eggert, Salz, Berets, et al
 
 Opening the software toolbox
 
@@ -15678,7 +15678,7 @@ outputs 1.0000000000000000007 twice and skips 1.0000000000000000008.
 @chapter File permissions
 @include perm.texi
 
-@include get_date.texi
+@include parse-datetime.texi
 
 @c              What's GNU?
 @c              Arnold Robbins