\Tempo not shown when R2 type rests, and not hight enough

[André Allavena]

The metronomic mark is not shown when the piece starts with R type rests. 
I might understand this behaviour with Score.skipBars set to true, but
not when it's false. 

Also, the higth is not adjusted (when there is a high pitch, the tempo
marking and the note are written on top of each other/

\score {
        \new Staff << \time 2/4 %\transpose do mib
                      { \clef treble % \key la \major
                        \set Score.skipBars = ##t
                        \tempo 4 = 152 R2*2 \break
                        \set Score.skipBars = ##f
                        \tempo 4 = 152 R2*2 \break
                        \tempo 4 = 152 r2 r2 \break
                        \tempo 4 = 152 \relative c''' a4  \break
                        }
                    >>
}

PS: great work!

André
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