Merge branch '2944_cleanup'

Merge branch '2944_cleanup'

* 2944_cleanup: (35 commits)
  Update all po/*.po files.
  Rename keymap files to be with .keymap suffix.
  (mc_config_new_or_override_file): minor optimization.
  Refactoring: use GString instead of "struct selection".
  (edit_translate_key): move from editkeys.c into editwidget.c
  Sync with gnulib 62bb7a8bf95807d6339e1e17fc0d21c319b280a2.
  Code refactoring in tests.
  Adjust look'n'feel of editor options dialog window.
  Clarify EN and RU man pages: list command line options alphabetically.
  (overwrite_query_dialog): adjust dialog size.
  Clarify widget redraw in runtime.
  (size_trunc_len): support automatic maximum unit for specified size.
  Fix formatting in manual pages.
  Fix wrapper location in description of -P/printwd option.
  (edit_insert_over): move from src/editor/editcmd.c into src/editor/edit.c.
  (edit_insert_column_of_text_from_file): refactoring:
  (edit_get_byte): refactoring: use edit_get_byte_ptr().
  Code refactoring in tests.
  Grammar fix in English man-page.
  (init_panelize): support --disable-nls.
  ...