Update documentation / autoupdate

[tholu]

How do I upgrade an existing installation of phpwcms to the latest version? This is an essential part of every software and I would like to see some regularly updated official documentation, ideally as UPDATE.md in the repository or at least in the Github Wiki.

Perfect would be an autoupdater similar to what Wordpress does.

[tholu]

Some links to recent questions and answers/hints about the update process, I'll try to extract some information from it:

1. Backup your files and database

2. Download current distribution as zip-file from Github

3. Use FTP/SCP to replace your current files (be careful with files probably modified by yourself in /template/inc_default and /template/inc_cntpart)

4. Login to the backend (database is automatically updated since version x.x.x)

5. Manually update conf.inc.php by comparing to dist.conf.inc.php
   https://forum.phpwcms.org/viewtopic.php?t=24371

6. Never use [PHP] anymore, replace such usages
   https://forum.phpwcms.org/viewtopic.php?t=24839

@slackero What do you think, anything missing?

[marcus-at-localhost]

I wouldn't replace template at all, instead compare with winmerge what is missing.