Rename pg_verify_checksums to pg_checksums

The current tool name is too restrictive and focuses only on verifying
checksums.  As more options to control checksums for an offline cluster
are planned to be added, switch to a more generic name.  Documentation
as well as all past references to the tool are updated.

Author: Michael Paquier
Reviewed-by: Michael Banck, Fabien Coelho, Seigei Kornilov
Discussion: https://postgr.es/m/20181221201616.GD4974@nighthawk.caipicrew.dd-dns.de

doc/src/sgml/ref/allfiles.sgml

@@ -199,6 +199,7 @@ Complete list of usable sgml source files in this directory.
 <!ENTITY pgarchivecleanup   SYSTEM "pgarchivecleanup.sgml">
 <!ENTITY pgBasebackup       SYSTEM "pg_basebackup.sgml">
 <!ENTITY pgbench            SYSTEM "pgbench.sgml">
+<!ENTITY pgChecksums        SYSTEM "pg_checksums.sgml">
 <!ENTITY pgConfig           SYSTEM "pg_config-ref.sgml">
 <!ENTITY pgControldata      SYSTEM "pg_controldata.sgml">
 <!ENTITY pgCtl              SYSTEM "pg_ctl-ref.sgml">
@@ -210,7 +211,6 @@ Complete list of usable sgml source files in this directory.
 <!ENTITY pgResetwal         SYSTEM "pg_resetwal.sgml">
 <!ENTITY pgRestore          SYSTEM "pg_restore.sgml">
 <!ENTITY pgRewind           SYSTEM "pg_rewind.sgml">
-<!ENTITY pgVerifyChecksums  SYSTEM "pg_verify_checksums.sgml">
 <!ENTITY pgtestfsync        SYSTEM "pgtestfsync.sgml">
 <!ENTITY pgtesttiming       SYSTEM "pgtesttiming.sgml">
 <!ENTITY pgupgrade          SYSTEM "pgupgrade.sgml">

doc/src/sgml/ref/pg_checksums.sgml

@@ -1,27 +1,27 @@
 <!--
-doc/src/sgml/ref/pg_verify_checksums.sgml
+doc/src/sgml/ref/pg_checksums.sgml
 PostgreSQL documentation
 -->
 
-<refentry id="pgverifychecksums">
- <indexterm zone="pgverifychecksums">
-  <primary>pg_verify_checksums</primary>
+<refentry id="app-pgchecksums">
+ <indexterm zone="app-pgchecksums">
+  <primary>pg_checksums</primary>
  </indexterm>
 
  <refmeta>
-  <refentrytitle><application>pg_verify_checksums</application></refentrytitle>
+  <refentrytitle><application>pg_checksums</application></refentrytitle>
   <manvolnum>1</manvolnum>
   <refmiscinfo>Application</refmiscinfo>
  </refmeta>
 
  <refnamediv>
-  <refname>pg_verify_checksums</refname>
+  <refname>pg_checksums</refname>
   <refpurpose>verify data checksums in a <productname>PostgreSQL</productname> database cluster</refpurpose>
  </refnamediv>
 
  <refsynopsisdiv>
   <cmdsynopsis>
-   <command>pg_verify_checksums</command>
+   <command>pg_checksums</command>
    <arg rep="repeat" choice="opt"><replaceable class="parameter">option</replaceable></arg>
    <group choice="opt">
     <group choice="opt">
@@ -33,12 +33,12 @@ PostgreSQL documentation
   </cmdsynopsis>
  </refsynopsisdiv>
 
- <refsect1 id="r1-app-pg_verify_checksums-1">
+ <refsect1 id="r1-app-pg_checksums-1">
   <title>Description</title>
   <para>
-   <command>pg_verify_checksums</command> verifies data checksums in a
+   <application>pg_checksums</application> verifies data checksums in a
    <productname>PostgreSQL</productname> cluster.  The server must be shut
-   down cleanly before running <application>pg_verify_checksums</application>.
+   down cleanly before running <application>pg_checksums</application>.
    The exit status is zero if there are no checksum errors, otherwise nonzero.
   </para>
  </refsect1>
@@ -84,7 +84,7 @@ PostgreSQL documentation
        <term><option>--version</option></term>
        <listitem>
        <para>
-        Print the <application>pg_verify_checksums</application> version and exit.
+        Print the <application>pg_checksums</application> version and exit.
        </para>
        </listitem>
      </varlistentry>
@@ -94,7 +94,7 @@ PostgreSQL documentation
       <term><option>--help</option></term>
        <listitem>
         <para>
-         Show help about <application>pg_verify_checksums</application> command line
+         Show help about <application>pg_checksums</application> command line
          arguments, and exit.
         </para>
        </listitem>

doc/src/sgml/reference.sgml

@@ -276,6 +276,7 @@
 
    &initdb;
    &pgarchivecleanup;
+   &pgChecksums;
    &pgControldata;
    &pgCtl;
    &pgResetwal;
@@ -283,7 +284,6 @@
    &pgtestfsync;
    &pgtesttiming;
    &pgupgrade;
-   &pgVerifyChecksums;
    &pgwaldump;
    &postgres;
    &postmaster;