(un)installations/upgrades
* If user cancels install, now CKAN checks if the process completed nevertheless and accordingly prints the message in log/status bar.
* Also deactivates Apply Changes button and Retry button in too late cancellations.
* Also stays on log tab after cancellation
* KNOWN ISSUE: Retry button not working - not sure if introduced with this commit

for success tracking, instead a new processSuccessful bool