Better debug prints for errors + fix error where header was interpreted wrong

src/life.cpp

@@ -188,16 +188,20 @@ int main() {
         return 1;
     }
 
-    if (lines.size() - 2 < rows) {
-        std::cerr << "There's less rows than described in the header!" << std::endl;
+    int possibleRows = lines.size() - 2;
+    if (possibleRows < rows) {
+        std::cerr << "There's less rows (" << possibleRows
+                  << ") than described in the header! (" << rows << ')'
+                  << std::endl;
         return 1;
     }
 
     Grid<Cell> grid(columns, rows);
     for (int x = 0; x < rows; x++) {
         std::string &row = lines[x + 2];
-        if (columns < row.size()) {
-            std::cerr << "There's less columns, than described in the header!"
+        if (columns > row.size()) {
+            std::cerr << "There's less columns (" << row.size()
+                      << "), than described in the header! (" << rows << ')'
                       << std::endl;
             return 1;
         }