Add some "overview".

Author: Markus Pfeiffer

PackageInfo.g

@@ -1,7 +1,7 @@
 ##
 ##  Datastructures: GAP package providing common datastructures.
 ##
-##  Copyright (C) 2015-2017  The datastructures team.
+##  Copyright (C) 2015-2018  The datastructures team.
 ##  For list of the team members, please refer to the COPYRIGHT file.
 ##
 ##  This package is licensed under the GPL 2 or later, please refer
@@ -84,8 +84,8 @@ Persons := [
 
 Status := "dev",
 
-SourceRepository := rec( 
-  Type := "git", 
+SourceRepository := rec(
+  Type := "git",
   URL := "https://github.com/gap-packages/datastructures"
 ),
 IssueTrackerURL := Concatenation( ~.SourceRepository.URL, "/issues" ),
@@ -137,15 +137,15 @@ Keywords := ["data structures", "algorithms"],
 AutoDoc := rec(
     TitlePage := rec(
         Copyright :=
-"""&copyright; 2015-17 by Chris Jefferson, Markus Pfeiffer, Max Horn, Reimer Behrends and others<P/>
-&datastructures; package is free software; 
-you can redistribute it and/or modify it under the terms of the 
-<URL Text="GNU General Public License">http://www.fsf.org/licenses/gpl.html</URL> 
-as published by the Free Software Foundation; either version 2 of the License, 
+"""&copyright; 2015-18 by Chris Jefferson, Steve Linton, Markus Pfeiffer, Max Horn, Reimer Behrends and others<P/>
+&datastructures; package is free software;
+you can redistribute it and/or modify it under the terms of the
+<URL Text="GNU General Public License">http://www.fsf.org/licenses/gpl.html</URL>
+as published by the Free Software Foundation; either version 2 of the License,
 or (at your option) any later version.""",
         Acknowledgements :=
-"""We appreciate very much all past and future comments, suggestions and 
-contributions to this package and its documentation provided by &GAP; 
+"""We appreciate very much all past and future comments, suggestions and
+contributions to this package and its documentation provided by &GAP;
 users and developers.""",
     ),
 ),

doc/intro.xml

@@ -13,7 +13,7 @@ The <Package>datastructures</Package> package for &GAP; has two main goals:
   <Item>Provide good low-level implementations for these datastructures</Item>
 </List>
 
-The package <Package>datastructures</Package> requires building of a kernel
+<Package>datastructures</Package> requires building of a kernel
 module for &GAP; to function, please refer to Chapter <Ref Label="install"/> for
 details; the package is not automatically loaded by &GAP; after it has been installed.
 
@@ -26,6 +26,8 @@ before its functions become available.<P/>
   <Heading>Overview over this manual</Heading>
 
   Chapter <Ref Chap="install"/> describes the installation of this package.
+  The remaining chapters describe the available datastructures in this package with
+  a definition of the supported API and details about provided implementations.
 </Section>