Activate current terminator instance instead of spawning new

[sandesh247]

Since terminator is many terminal windows in one, perhaps when you run a new instance of 'terminator', you want to bring the current one in focus if it's already there. Maybe with a new tab. Maybe (should be configurable, IMHO).

Current scenario:
I use Windowmaker for window management. I have a keyboard shortcut bound to terminator. However, I don't want it to start new terminators if one already exists, just bring the current one up, and either bring the window to the current workspace (preferable), or switch to the relevant workspace.

This could be classified as a window manager feature, but there are many applications with the "single-instance" mode.