ocpkg behaves differently iff invoked as ```octool```. If ocpkg is invoked as ```ocpkg``` (or any other name), it may perform an unwanted git-clone or git-pull. Safer to direct the user to octool, which will just spit out usage guidance if invoked with no arguments, e.g.

```
~/opencog/scripts/octool 
Usage: octool OPTION
 -a Add software repositories
 -d Install build dependencies
 -u Update OpenCog source at /home/dhart/opencog/src
 -b Build OpenCog
 -t Test OpenCog
```

If anything, I should fix up ocpkg to skip the git clone/pull if invoked as ```install-dependencies-trusty```, i.e. to behave strictly the same as ```octool -a -d```. Merging this pull now however will be immediately useful.