Avoid lonely date in preface

Preface.tex

@@ -26,14 +26,14 @@ \chapter*{About this version}
 Both this and the full version are maintained by St\'ephane Ducasse and Serge Stinckwich.
 Remember that we are all Charlie.
 
-\bigskip\noindent
---- 28 January 2015
+\bigskip
+\relboxr{1}{28 January 2015}
 
 
 
 \chapter*{Preface}
 
-\vspace{10 ex} \begin{flushright} {\sl Si je savais une chose
+\begin{flushright} {\sl Si je savais une chose
 utile \`{a} ma nation qui f\^{u}t ruineuse \`{a} une autre,\\je ne
 la proposerais pas \`{a} mon prince,\\parce que je suis homme
 avant d'\^etre Fran\c cais,\\parce que je suis n\'ecessairement
@@ -45,7 +45,7 @@ \chapter*{Preface}
 \end{flushright}
 
 
-\vspace{8 ex} When I first encountered object-oriented
+When I first encountered object-oriented
 programming I immediately became highly enthusiastic about it,
 mainly because of my mathematical inclination. After all I learned
 to use computers as a high-energy physicist. In mathematics, a
@@ -55,7 +55,7 @@ \chapter*{Preface}
 premises as the original one. In object-oriented language, this is
 called reuse and inheritance. Thus, numerical algorithms using
 mathematical concepts that can be mapped directly into objects.
-\par
+
 This book is intended to be read by object-oriented programmers
 who need to implement numerical methods in their applications. The
 algorithms exposed here are mostly fundamental numerical
@@ -64,7 +64,7 @@ \chapter*{Preface}
 language is feasible and quite easily feasible. We expect readers
 to be able to implement their own favorite numerical algorithm
 after seeing the examples discussed in this book.
-\par
+
 The scope of the book is limited. It is not a Bible about
 numerical algorithms. Such Bible-like books already exist and are
 quoted throughout the chapters. Instead I wanted to illustrate how
@@ -73,7 +73,7 @@ \chapter*{Preface}
 in real applications over 12 years of object-oriented programming.
 Thus, the reader can be certain that the algorithms have been
 tested in the field.
-\par
+
 Because the intent of the book is showing numerical methods to
 object-oriented programmers the code presented in commented in
 depth. Each algorithm is presented with the same organization.
@@ -86,7 +86,6 @@ \chapter*{Preface}
 are just interested in using the algorithm. Then, the code
 implementation is discussed and presented.
 
-
 As far as possible each algorithm is presented with such example
 of use. I did not want to build contrived examples. Instead I have
 used examples personally encountered in my professional life. Some
@@ -131,7 +130,8 @@ \chapter*{Preface}
 and who did a terrific job of rendering the early manuscript not
 only readable but entertaining.
 
-\vspace{5 ex}\relboxr{1}{Genolier, 11 April 2000}
+\bigskip
+\relboxr{1}{Genolier, 11 April 2000}
 
 
 \ifx\wholebook\relax\else\end{document}\fi