Automatically write chat logs to disk every X minutes

[fontknocker]

Chat logs should be automatically written to disk every few minutes (or when a message arrives/leaves, perhaps). This prevents data loss if KMess crashes.

To do this means rewriting the chat save code so that it is capable of appending to the log file only the messages that have arrived/been sent since the last save.

Topic reference

[fontknocker]

I'll take hold of this one. I want to give the saving of chat logs a reworking for 2.1.

[valerio]

Implemented recently, in the chathistory-new branch.