Prevents GoDaddy secret and key from exposure via ps.

There is still an issue if environment variables can be read.

all files

Simplifies installation; private directory no longer required since
the scripts don't need to be customized.

-v makes sure that the installer knows what is happening.

Old versions did not return correct exit status.
Did not provide for pre/post processing hooks (e.g. to mount a disk)
Required custom edits/copies for each instance.

These fix all those issues.

Issue #288

Uses the GoDaddy "Developer" API to add and remove the ACME challenge
records.

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.

tidied up upgrade tmpfile handling (1.95)