optionally word-wrap group names in tree display

[westram]

Motivation:

Long group names as Firmicutes, Tenericutes, Negativicutes and Cyanobacteria result in broad dendrogram treeviews when group-brackets are shown. Doing a zoom-reset (e.g. by resizing the window) hence results in a X-squeezed view, i.e. the -structure itself only uses a few % of available width.

Implementation:

• add Word-wrap group names? to options
• word-wrap group name at spaces or hyphens
  • pass max. allowed lines to wrapper-function (depends on vertical size of group-dendrogram or -bracket, on fontsize and on extra lines needed for other information as number of marked species)
  • examples for 5, 4, 3 and 2 lines allowed:

    Firmicutes,
    Tenericutes,
    Negativicutes
    and
    Cyanobacteria
    

    Firmicutes,
    Tenericutes,
    Negativicutes
    and Cyanobacteria
    

    Firmicutes, Tenericutes,
    Negativicutes and
    Cyanobacteria
    

    Firmicutes, Tenericutes,
    Negativicutes and Cyanobacteria
    

  • optimize for minimal X-width (and minimal Y-width as 2nd criteria)