cleanup: remove dead code, fix bugs, refactor SSH dest parsing

- Remove debug printf calls from file.c
- Remove dead code: chunk_print, chunk_format, chunk_data_create/delete
- Remove unused config.use_single_send_per_file field
- Fix server_delete() no-op (double-pointer)
- Fix double cast (long)(long) -> ptrdiff_t in chunk.c
- Fix thread return value: thrd_error instead of 1
- Remove unused config param from receive_chunk_enqueue()
- Make queue_double_capacity() static
- Move SSH dest parsing into config.c as config_parse_ssh_dest()
- Fix test_config_ssh_dest to test parsing round-trip
- Remove chunk_format test (obsolete format)
- Replace chunk_data_delete with data_destroy in tests

src/shared/file.c

@@ -80,7 +80,6 @@ void file_load_data(File *file) {
       exit(EXIT_FAILURE);
     }
   }
-  printf("%ld is file big", file->data->size);
   size_t bytes_read = file_content_to_buffer(file);
   if (bytes_read != file->data->size) {
     log_message(STATUS_ERROR, "Didnt read expected amount of bytes from file");
@@ -88,12 +87,6 @@ void file_load_data(File *file) {
   }
 }
 
-void file_print(void *item) {
-  if (item == NULL)
-    return;
-  printf("%s\n", ((File *)item)->path);
-}
-
 static void metadata_send(int file_descriptor, FileMetadata *m) {
   if (m == NULL) {
     int zero = 0;
@@ -127,7 +120,6 @@ void file_send_single_calls(File *file, int file_descriptor, bool use_metadata)
   send_str(file_descriptor, file->path);
   if (use_metadata)
     metadata_send(file_descriptor, file->metadata);
-  printf("Sending File: %ld", file->data->size);
   send_data(file_descriptor, file->data->data, file->data->size);
 }