Bug report with tablature and quater-tone scordatura

[Bernardo Barros]

Hi all,

I found a bug when working with tablature with a quarter-tone. See the third string for example.
I can't do this:
    \set TabStaff.stringTunings = #'(3 -1 -5.5 -11 -15 -21)
Because I get things like 0.5 in the score.

It's better to round to 6 rather then 5. 
If I round to 6 it's better, because it works with *almost* every note. BUT... not with the open string.
When I write a note equivalent to an open-string I get an "1" instead of "0".

fisih\3 show "1" and not "0"

It's ALMOST working but there is this little bug. I hope it is easy to fix. :-)

    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    
\time 6/8
    <ees\5 g\4 cih'\3>32\ff[
    <b\5 ees'\4 aeh'\3>16
    <fis''\2 beh''\1>8\p
    <aes\4 cih'\3 ees'\2 aeh'\1>16-.->
    r32
    g16~\5\pp\<
    \times 6/5 {
        <g~\5 bes~\4 g'~\2>16
        <g\5 bes\4 g'\2 beh'\1\harmonic>8.\mp\!
        <g\5 bes\4 fisih\3 g'\2 beh'\1>32-.->
        r32]
    }