#137 double slider - single "tick" when large range

[Rob Lintern]

double slider - shows single "tick" only when large range
ex. with NCI Thesaurus range is [0, 95568] for
#descendents

[N_Rather]

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Fixed the "single tick problem" but the design of the slider needs to be
reworked.

Think about: Huge ranges, how to divide them properly, color coding...