Dear Waldek,
[...]
At github there is updated manual (changes to earlier versions are small, but for example it contains up-to-date features list).
Do I understand you correctly:
https://github.com/hebisch/gpc is the current repository for GNU Pascal source and documentation.
If this is the case you should enable others to update the wiki.
PS: I contacted Peter Gerwinski via PM if he is still watching this mailing list and who/how somebody could be authorized to update www.gnu-pascal.de.
-- Bernhard