added cell_line info to ZMenu
This commit was manufactured by cvs2svn to create branch 'branch-
ensembl-58'.

Cherrypick from master 2010-05-25 15:00:49 UTC Beth Yates <bp1@sanger.ac.uk> 'new glyphset for multi_wiggle_data':
    modules/Bio/EnsEMBL/GlyphSet/fg_multi_wiggle.pm
display empty_tracks
changed render style
removed warn
added new multi wiggle code
restricted to display only data from IMR90
reverted labels to e57 versions
dont display error message for multicell wiggle - currently disabled
changed rendering style
fixed position
fixed max Y axis for IMR90
added number of peak tracks on label
removed warn
tweaked display
brought back code removed by sb23 in  revision 1.109.2.2 as change broke display of oligo probes
fix this crap again
fix zmenu links