* scm/markup.scm (define-markup-command): change

* scm/markup.scm (define-markup-command): change
def-markup-command to define-markup-command

* scm/music-functions.scm (define-music-function): change
def-music-function to define-music-function.

* python/convertrules.py (conv): rules for def-music-function
and def-markup-commands

* Documentation/user/programming-interface.itely,
input/no-notation/display-lily-tests.ly,
input/regression/lily-in-scheme.ly,
input/regression/markup-user.ly,
input/regression/music-function.ly, input/regression/tie-chord.ly,
scm/fret-diagrams.scm, ly/music-functions-init.ly,
ly/gregorian-init.ly: use new macro names (define-music-function,
define-markup-command).