Allowing long names to break in the cv title again (#221)

* allow long names in titles to break

Until now, a `~` (non breaking space) connects first
and last name in the cv title. This prevents long
names to break correctly. This commit replaces the space
with `\ `, a space that allows breaking.

Fixes #220

* added changelog entry

* removed non-breaking space in names from other headlines, too

moderncvheadvi.sty

@@ -55,7 +55,7 @@
   \setlength{\makeheaddetailswidth}{\textwidth}%
   % name and title
   \if@left\hfill\fi%
-  \firstnamestyle{\@firstname~}\lastnamestyle{\@lastname}%
+  \firstnamestyle{\@firstname\ }\lastnamestyle{\@lastname}%
   \ifthenelse{\equal{\@title}{}}{}{\titlestyle{~|~\@title}}\\[-.35em]% \isundefined doesn't work on \@title, as LaTeX itself defines \@title (before it possibly gets redefined by \title)
   % rule
   {\color{bodyrulecolor}\rule{\textwidth}{.25ex}}}