Log Message:
Updated latexmk to 448.

From v. 4.45 to 4.46
  Correct creation of output and aux directories to correctly handle
  relative paths when -cd is used.
  Minor documentation corrections.

From v. 4.46 to 4.48
  Correct documention: default value of $recorder is 1
  Add routines rdb_list_source, rdb_set_source for manipulating
    dependency lists of a rule.  Add these to the documentated
    interface, in addition to the already documented rdb_ensure_file,
    rdb_remove_files.
  Update webpages in documentation.