Commit 056ec02b authored by Alexandre Duret-Lutz's avatar Alexandre Duret-Lutz

doc: add some troubleshooting help

Inspired by #375.

* README: Add a section about troubleshooting installations.  Mention
GraphViz as optional dependency.
* doc/org/install.org: Mention the troubleshooting section from INSTALL.
parent 188d2105
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