Changed "Flat package": fixed Admin web page problem with DSM 5.
Added extra large icon for DSM 5.
Now based on Baikal "Flat package" 0.2.7, extract from its ChangeLog.md:
. New error detection: composer has not been installed
. Corrected the http/https protocol detection
. Auth more compatible with Synology software
. Improved CardDAV and CalDAV auth compatibility with Windows Phones
. Make calendar description optional
. Make HTML5 shiv a local resource
. Improve application security
. Prevent PHP from parsing your MySQL credentials
Also touch ENABLE_INSTALL when upgrading (to start upgrade wizard)
Tested with DSM 4.3-3827
For DSM 5.0 (not tested) set ownership of web files to "http" instead of "nobody"