Limit the number of iterations for some tabular features in math

Try to please Coverity scan.

development/coverity_modeling.cpp

@@ -36,4 +36,15 @@ void lyxbreaker(void const * data, const char * hint, int size)
 }
 
 
+template<class T>
+void CoordCache<T>::check(T const * thing, char const * hint) const
+{
+	typename cache_type::const_iterator it = data_.find(thing);
+
+	if (it == data_.end() || it->second.pos.x == -10000)
+		__coverity_panic__();
+}
+
+
+
 }

src/mathed/InsetMathGrid.cpp

@@ -59,11 +59,12 @@ static docstring verboseHLine(int n)
 }
 
 
+// read a number to be used as an iteration count (limited arbitrary to 1000)
 static int extractInt(istream & is)
 {
 	int num = 1;
 	is >> num;
-	return (num == 0) ? 1 : num;
+	return min(max(num, 1), 1000);
 }