Indigo Igloo: release documentation

[jack-oquin]

There are some new features targeted for Indigo which require documentation. We may need a doc review. This issue is for tracking and discussion of the work to be done.

I plan to increment the minor number for the Indigo release to 1.10.0. The other updates appear to be bug fixes, with no documentation changes required. I will probably release some of them as 0.9.5 to Hydro.

• Trigger support
• Services to get and set control registers
• Documentation review

@bgromov, @bricerebsamen, @tpet, @mikepurvis, @ktossell: please review this list of completeness. Am I forgetting something?

[jack-oquin]

Wiki page road map updated to mention new Indigo features.