Pre-requisites for ubuntu install#2

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jphuart wants to merge 6 commits intocelray:masterfrom

Commits on Oct 8, 2020

comments on prerequisites for ubuntu install
jhuart
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Commits on Oct 16, 2020

Update of install instruction + new swatplus_wgn.sqlite source
jhuart
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Commits on Apr 23, 2021

Commits on Oct 5, 2021