Case insensitive processing of agreement url because of HTTP/2

Fixes #425

Spelling

Pipe the commands to nsupdate

Use HTTP 1.1 as workaround atm

Co-authored-by: Robert Eden <rmeden@yahoo.com>

Fixes #423

[Route53] Make a stricter comparison for matching against zone names

This adds a dot in front of the fqdn and the zone name, so the
comparison will only check against full DNS parts of the fqdn and the
zone name. This will prevent to match a fqdn against an unrelated zone
name which overlaps with the wanted zone in the naming.

Fixes #398

Adding the Route53 dns script and some docs.

Adding support for OVH managed DNS

Minor formatting and punctuation fixes.

Add OCSP Must-Staple

Add OCSP Must-Staple

This implements a new variable OCSP_MUST_STAPLE which adds the OCSP Must-Staple detail to the SAN section of the CSR.
If the openssl version is >= 1.1.0, one can also use "tlsfeature = status_request".
See [this blog post](https://scotthelme.co.uk/ocsp-must-staple/) for more details.

Include install (Makefile) and the Arch Linux packages

Add Makefile with install target

Provide GPLv3 rather than GPLv2

Make scripts executable by default

This adds a simple Makefile which can be used to install the software.
Currently there is only a single install target.