Two sided mode in LilyPond version 2.18.2.

[Mirosław Doroszewski]

Two sided mode in LilyPond version 2.18.2.

1. Usually printed publications are made int two sided mode.
2. It implies that istead of margins left and right are inner and outer.
3. Bug: when two sided mode is set (two-sided = ##t), then margins are
always the same and unexpected, even with changing settings of default
inner and outer margins.
4. Additionally, when line width is set too, then left and right
margins are the same.
5. So, setting line width unsets two sided mode (and unsets setting of
left and right margins).
7. Per analogiam: if it is possibility of setting left and right
margins in one side mode, should not be possibility of setting inner
and outer margins too?
7. Proposition: new seetings of inner and outer margins in two sided mode, i.e.:
\paper {
  two-sided = ##t
  inner-margin = 10\mm
  outer-margin = 20\mm
}