Updated to Debian Buster, changed php.ini update method, changed to MariaDB

Add a hack to allow the user to specify the MySQL storage engine

Add ImageMagick Apache module for smoother integration

Especially concurrency management is bad when we for instead of use the module.

Adapt php.ini changes to Debian PHP 7 package template, reduce layers

Update Dockerfile to allow video support

See https://github.com/xbgmsharp/piwigo-videojs/wiki/How-to-add-videos#if-you-are-using-debianubuntu-like-distribution

Update to Piwigo 2.9.3

https://github.com/mathieuruellan/docker-piwigo/issues/11

Method to add/override PHP configuration from files in mounted volume

entrypoint.sh:  For every file in /config/php/apache2.d/, symlink to that file from /etc/php/7.0/apache2/conf.d/

Small README.md fixes

Update Piwigo version to 2.9.2

Update Piwigo version to 2.9.1

- Update Piwigo
- Move from hard coded value to ARG variable

added php5-curl for Social Connect

Update to Piwigo 2.8.2, replace fig with docker-compose