add hotkeys to select species in tree

[westram]

Jump to species

by [15691]

key	selected species	if none selected yet	folded groups?
down	next	first	skip over
up	previous	last	skip over
home	first		skip over
end	last		skip over
ctrl-down	next marked	first marked	unfold
ctrl-up	previous marked	last marked	unfold
ctrl-home	first marked		unfold
ctrl-end	last marked		unfold

next/last := towards bottom of
previous/first := towards top of

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Related: Jump to groups

by [15731]

	if selection is …
key	group	species	nothing
meta-down	next with same tax-level	next after enclosing	first
meta-up	previous with same tax-level	previous to enclosing	last
meta-left	parent	enclosing group	-
meta-right	first child	-	-

"Jumping to a group" should

• select the group (as implemented with #709)
• reposition scrolling (as jump species does)

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General:

• it would be nice if temp. unfolded groups would fold again when next jump is performed by [15691]