Improve the Chat History features

[valerio]

The Chat History should be more integrated within KMess.

1. A "Show History" option should be present in the list & chat's contextmenu for every contact, maybe even disabled if there's no past chats;
2. The number of messages from the last conversation shown in new chats should be configurable;
3. Maybe also integrate the history in the contact properties dialog, somehow (another tab with a contact history widget in common with the global history dialog??); unnecessary now, it's in the right-click menu
4. Quick access to chat history search with a button, other than Ctrl+F;
5. Maybe a print button, too

 Topic reference

[diederik]

• I'd also vote for improving the sidebar icons, e.g. show a friendlyname like the invite dialog does.
• Show a progressbar when loading a full history of a contact. It does take time.

[valerio]

Also, keyboard shortcuts and context menus aren't working in this dialog. (thx pano)