shell: configura estilos interno e externo de ExpandBar.

Signed-off-by: Francisco Prates <mad.kanie@gmail.com>
tasksel: tenta centralizar grupos na pagina.

Signed-off-by: Francisco Prates <mad.kanie@gmail.com>
texteditor: nao grava texto se for nulo.

Signed-off-by: Francisco Prates <mad.kanie@gmail.com>