Respect required maxlen and prec in double::to_s

pub/lib/obj.cpp

@@ -10,8 +10,10 @@
 #include <string>
 #include <vector>
 #include <cmath>
+#include <boost/format.hpp>
 
 using namespace std;
+using boost::format;
 
 #include "defs.hpp"
 #include "ptr.hpp"
@@ -48,7 +50,9 @@ string CObjInt::to_s( int maxlen, int minlen, int prec ) const
 
 string CObjDbl::to_s( int maxlen, int minlen, int prec ) const
 {
-    return S(val);
+    string form = str( format( "%%#%i.%ig" ) % maxlen % prec );
+    string ret = str( format( form ) % val );
+    return ret;
 }
 
 //! Returns textual representation of the class instance, for debugging.