restructuring - use topoplot_common consistently in all ft_topoplotXX functions, pre and postamble should be done in the high level function. Speed up ft_topoplotIC.m by calling ft_prepare_layout.m only once (not any more in topoplot_common)


git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@9736 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0