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Backspace character deletion (#51)

* added backspace deletion in append and insert

--- a/tui_main.c

+++ b/tui_main.c

@@ -2364,6 +2364,14 @@

       break;

     case 127: // backspace in terminal.app, apparently

     case KEY_BACKSPACE:

+      if (ged_state.input_mode == Ged_input_mode_append) {

+        ged_dir_input(&ged_state, Ged_dir_left, 1);

+        ged_input_character(&ged_state, '.');

+        ged_dir_input(&ged_state, Ged_dir_left, 1);

+      } else {

+        ged_input_character(&ged_state, '.');

+      }

+      break;

     case CTRL_PLUS('h'):

     case KEY_LEFT:

       ged_dir_input(&ged_state, Ged_dir_left, 1);