1.2.1:
    * PHP 8 compatibility fix: Use language constant loading API,
      ski[ dot files when emptying directory

1.2:
    * Drop unnecessary time-elapsed messaged and microsleep steps
    * Stop if plugins are not current

1.1.10: Repeat file integrity check for text files that were treated as binary
        files in S9y versions < 2.3

1.1.9: Add config setting 'disable_integrity_checks' to disable file integrity
       checks for one run (see https://board.s9y.org/viewtopic.php?f=1&t=24492)

1.1.8: Iconfont a11y fix (yellowled)

1.1.7: Fix beta-version upgrade by using github-archive path and making the
       file detection more reliable

1.1.6:

    * When curl download could not be tried, detect this as fail
    * Improve error messages if update can't be downloaded
    * Don't check checksums for beta

1.1.5:

    * Check for broken existing zip file
    * Set new requirement for PHP 5.2+

1.1.4:

    * Check into github repository from now on
    * Remove dashboard plugin dependency with >= 2.0

1.1.3: Fix bug when trying to download with cURL

1.1.2: some fixes for 2.0

1.1.1: (html)specialchars for PHP 5.4 charset changes

1.1: Translated and faked message unicode-icons to Chrome Browser, since this 
     does not work with all native unicodes (like clock and triangled <!>).

1.0: Enable flush to work on FastCGI servers

0.9: Check if ZIP extension is installed and loaded

0.8: Use native API method serendipity_db_escape_string()

0.7: Added on error RELOAD note

0.6:

    * Added install by USERLEVEL_ADMIN only
    * changed some lang <en> <de> Constants; this also removed the
      experimental status

0.5: View and follow upgrade process

0.4:

    * Fixed checksums var
    * Enhanced cleanTemplatesC()
    * Added some debug and process messages

0.3: Compatibility fixes [brockhaus]

0.2:

    * Fixed: Didn't create new directories which were part of the new version
    * Fixed: Choked on new files of the new version which didn't exist
             in the old version
    * Clean cachefiles in templates_c just before the upgrade to prevent
      display-errors 

0.1.2:

    * Fixed call-by-reference-warning in php 5.3
    * Added checksum-test prior to unpacking to kind of authenticate
      the update
    * Added checksum-test after unpacking to check the integrity