Move around the text of the Vinum introduction a bit, in an effort to
make more meaningful the text of the paragraph:
<para><emphasis>Vinum</emphasis> is a so-called <emphasis>Volume Manager</emphasis>, a virtual disk driver that addresses these three problems. Let us look at them in more detail. Various solutions to these problems have been proposed and implemented.</para>
which seemed very out of place in the previous version of the text.
Noticed by: ganbold@micom.mng.net
Patch by: yours truly