topcat: display array-valued column aux metadata properly.

This is a bit of a hack.  The display in the ColumnInfoWindow is not
paying attention to the ValueInfo's formatValue method, which is in
any case not a very good place for that functionality.  But it now
works for scalars and normal arrays.
topcat: intermediate version v4.0-1+
topcat: move some SAMP MType text to right place in sun253
ttools: avoid overlapping tick labels in layer plots
ttools: move formatting routine to PlotUtil class
cdf: cope with multi-element CDF types

EPOCH16 is effectively a double[2], make sure that this is handled
properly in the corresponding ValueInfos.
topcat: fix column info window boolean metadatum display.

Regression bug, Visible column was being shown as "true/false", not
a checkbox.
topcat: acknowledge Juande Sandander Vela.

He's been very helpful untangling OS X application signing issues.
topcat: fix coord panel indexing bug