Fixed corrupted messages when reopening a rosbag with a different file

* Cleaned up more state in Bag::close() and ChunkedFile::close()
* It was not investigated how exactly the bug worked

tools/rosbag_storage/src/bag.cpp

@@ -173,6 +173,21 @@ void Bag::close() {
     chunks_.clear();
     connection_indexes_.clear();
     curr_chunk_connection_indexes_.clear();
+
+    mode_ = bagmode::Write;
+    version_ = 0;
+    compression_ = compression::Uncompressed;
+    chunk_threshold_ = 768 * 1024;  // 768KB chunks
+    bag_revision_ = 0;
+    file_size_ = 0;
+    file_header_pos_ = 0;
+    index_data_pos_ = 0;
+    connection_count_ = 0;
+    chunk_count_ = 0;
+    chunk_open_ = false;
+    curr_chunk_data_pos_ = 0;
+    current_buffer_ = 0;
+    decompressed_chunk_ = 0;
 }
 
 void Bag::closeWrite() {

tools/rosbag_storage/src/chunked_file.cpp

@@ -148,6 +148,8 @@ void ChunkedFile::close() {
     filename_.clear();
 
     clearUnused();
+    offset_ = 0;
+    compressed_in_ = 0;
 }
 
 // Read/write modes