automationdev300m87: #i112208# - Implemented fuction to work with a local copy of a file which resides anywhere else in the filesystem. The file is then copied to the users work directory and opened from there. This is experimental and the function needs to be called explicitly. The function is another workaround for the paramount problem that we cannot reliably switch a readonly document to edit-mode. Used the opportunity to introduce a new global variable (and fix the case of others, as they are not constants as they were initially planned to be)