DIRACGrid/DIRAC — pull request #957 by mirguest (2012-09-24 09:13:41+00:00)
Title: Integration: Add sub command completions in File Catalog Command Line Interface

Hi, I am a student in IHEP, China. We use DFC to
query some information.

I found the DFC command line interface has some bugs,
such as index out of range. The command line auto completion
is also another problem.

I add some completions for some *sub* commands,
so that we can use to get the sub commands.
For an example, when we in DFC:

```
FC:/> meta
get index metaset remove rm set show tag tags
```

In the future, I will add some code to keep the cmd more safe,
especially the index out of range errors.
The *LFN* directory completion is also an interesting work.