GitLab

Added an optional callout to the end of the interaction function. I put it in to allow me to put the window focus on MacVim / GVim depending on the different OS I happen to be on

Fixed: If you callvim on a non-existant file with a relative path, the CWD of the running gvim process is used, and that's not right.  We use the PWD explicitly instead, in this case