[0.17] Add OptionsCategory::ELEMENTS#453

Merged

instagibbs merged 5 commits intoElementsProject:elements-0.17from

stevenroose:params-elements

Nov 27, 2018

Commits on Oct 29, 2018

Add OptionsCategory::ELEMENTS
stevenroose
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Commits on Oct 30, 2018

Set correct OptionsCategory for elements options
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Commits on Nov 9, 2018

Also change Elements-specific chainparams
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Commits on Nov 20, 2018

Sane defaults for CHAINPARAM cli args
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Commits on Nov 26, 2018

Mark chain params as ::CHAINPARAMS
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