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

moderncvheadv.sty

@@ -94,7 +94,7 @@
       % name and optional title
       \newlength{\makecvheadpictureboxskip}%
       \setlength{\makecvheadpictureboxskip}{\totalheightof{\usebox{\makecvheadpicturebox}}}%
-      \firstnamestyle{\@firstname~}\lastnamestyle{\@lastname}%
+      \firstnamestyle{\@firstname\ }\lastnamestyle{\@lastname}%
 	  \ifthenelse{\equal{\@title}{}}{
 	    \ifthenelse{\isundefined{\@quote}}%
         {}%