Extend edge style functionality

[dan-knight]

Description

Closes #98, #99, #100, #104.
New columns in tree input:

Style	Column
Node Colour	node.col
Node Label Colour	node.label.col
Node Border Colour	border.col
Node Border Width	border.width
Node Border Line Type	border.type
Edge Colour	edge.col.2, edge.col.2
Edge Width	edge.width.2, edge.width.2
Edge Line Type	edge.type.2, edge.type.2

Removes obsolete seg.col parameters for consistency.

Checklist

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