Add rationale for Libpipeline, and make some other minor cosmetic changes.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@10127 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

prologue/why.xml

@@ -99,6 +99,14 @@
         patches, and are also used in many packages' build procedures.</para>
       </listitem>
 
+      <listitem>
+        <para>E2fsprogs</para>
+
+        <para>This package contains the utilities for handling the ext2, ext3
+        and ext4 file systems.  These are the most common and thoroughly
+        tested file systems that Linux supports.</para>
+      </listitem>
+
       <listitem>
         <para>Expect</para>
 
@@ -108,14 +116,6 @@
         toolchain.</para>
       </listitem>
 
-      <listitem>
-        <para>E2fsprogs</para>
-
-        <para>This package contains the utilities for handling the ext2, ext3
-        and ext4 file systems.  These are the most common and thoroughly
-        tested file systems that Linux supports.</para>
-      </listitem>
-
       <listitem>
         <para>File</para>
 
@@ -257,6 +257,14 @@
         Man-DB for viewing manpages.</para>
       </listitem>
 
+      <listitem>
+        <para>Libpipeline</para>
+
+        <para>The Libpipeline package contains a library for manipulating
+        pipelines of subprocesses in a flexible and convenient way. It is
+        required by the Man-DB package.</para>
+      </listitem>
+
       <listitem>
         <para>Libtool</para>
 
@@ -334,16 +342,7 @@
         by the <application>diff</application> program.  It is needed by
         the build procedure for several LFS packages.</para>
       </listitem>
-<!--
-      <listitem>
-        <para>PCRE</para>
 
-        <para>This package provides a library that can be used to implement
-        regular expression pattern matching using the same syntax and semantics
-        as Perl 5.  It is a mandatory dependency of Glib, and can also be used
-        by Grep.</para>
-      </listitem>
--->
       <listitem>
         <para>Perl</para>
 
@@ -360,14 +359,7 @@
       </listitem>
 
       <listitem>
-        <para>Popt</para>
-
-        <para>This package is a library used by some programs to parse
-        command line inputs.</para>
-      </listitem>
-
-      <listitem>
-        <para>Procps</para>
+        <para>Procps-NG</para>
 
         <para>This package contains programs for monitoring processes. These
         programs are useful for system administration, and are also used by