Quote annotation in serialization to prevent splitting by lexer

Closes #183

ChangeLog

@@ -31,6 +31,7 @@
 - #167    Cannot shorten interval to zero length
           (thanks to janikrabe)
 - #174    Interval is split in two when it encloses month border
+- #183    Hyphen in annotation gets padded with spaces
 -         Fixed error from totals.py while timer is active
           (thanks to davisdude)
 -         Refactoring of Interval and Range

src/Interval.cpp

@@ -89,7 +89,7 @@ std::string Interval::serialize () const
   if (! annotation.empty ())
   {
     out << (_tags.empty () ? " #" : "")
-        << " # " << annotation;
+        << " # \"" << annotation << "\"";
   }
 
   return out.str ();