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

moderncvheadiii.sty

@@ -83,7 +83,7 @@
   \parbox{\makeheaddetailswidth}{%
     \centering%
     % name and title
-    \firstnamestyle{\@firstname~}\lastnamestyle{\@lastname}%
+    \firstnamestyle{\@firstname\ }\lastnamestyle{\@lastname}%
     \ifthenelse{\equal{\@title}{}}{}{\titlestyle{~|~\@title}}% \isundefined doesn't work on \@title, as LaTeX itself defines \@title (before it possibly gets redefined by \title)
     % optional detailed information
     \if@details{%