Pre-release of Version 2.1.8

[Alan DeKok]

Bjørn Mork wrote:
> The v2.1.x branch from github up to and including commit
> 1d80707880c1bf94ad1e87be74221a6c7b4cb4c7 has now been running stable for
> more than 5 days for me.  All the previously reported problems seem to
> be gone.  So I'd say it makes a good 2.1.8 release for Christmas.

  Thanks.  I've added a bunch more minor changes (docs, checks from
static analysis tools, etc.)  But no more code changes.

  It should be good to go...

  Alan DeKok.