Remove -i/--ignore-version option from pg_dump, pg_dumpall and pg_restore.

The commit c22ed3d523 turned
the -i/--ignore-version options into no-ops and marked as deprecated.
Considering we shipped that in 8.4, it's time to remove all trace of
those switches, per discussion. We'd still have to wait a couple releases
before it'd be safe to use -i for something else, but it'd be a start.

doc/src/sgml/ref/pg_dump.sgml

@@ -279,16 +279,6 @@ PostgreSQL documentation
       </listitem>
      </varlistentry>
 
-     <varlistentry>
-      <term><option>-i</></term>
-      <term><option>--ignore-version</></term>
-      <listitem>
-       <para>
-        A deprecated option that is now ignored.
-       </para>
-      </listitem>
-     </varlistentry>
-
      <varlistentry>
       <term><option>-j <replaceable class="parameter">njobs</replaceable></></term>
       <term><option>--jobs=<replaceable class="parameter">njobs</replaceable></></term>

doc/src/sgml/ref/pg_dumpall.sgml

@@ -120,16 +120,6 @@ PostgreSQL documentation
       </listitem>
      </varlistentry>
 
-     <varlistentry>
-      <term><option>-i</></term>
-      <term><option>--ignore-version</></term>
-      <listitem>
-       <para>
-        A deprecated option that is now ignored.
-       </para>
-      </listitem>
-     </varlistentry>
-
      <varlistentry>
       <term><option>-o</></term>
       <term><option>--oids</></term>

doc/src/sgml/ref/pg_restore.sgml

@@ -216,16 +216,6 @@
       </listitem>
      </varlistentry>
 
-     <varlistentry>
-      <term><option>-i</option></term>
-      <term><option>--ignore-version</option></term>
-      <listitem>
-       <para>
-        A deprecated option that is now ignored.
-       </para>
-      </listitem>
-     </varlistentry>
-
      <varlistentry>
       <term><option>-I <replaceable class="parameter">index</replaceable></option></term>
       <term><option>--index=<replaceable class="parameter">index</replaceable></option></term>