show the wildcard query suggestions

**Changes:**
* show clickable query suggestions (not only wildcard patterns)
* minor rewrite of "error" messages
* fixed presentation in CLI mode (removed extra spaces)

**Now the results look as following**:
![wildcard_one_match](https://f.cloud.github.com/assets/213426/1574020/c47ddc46-5137-11e3-9545-2bd1d815298e.png)
![wilcard_multiple_matches](https://f.cloud.github.com/assets/213426/1574021/cac1e62e-5137-11e3-83f2-b28c2bffd4b9.png)

from CLI:
```
$ python ~/das_client.py --host=http://localhost:8212 --query="dataset=*Zmm*"
status: fail, reason: Can not interpret the query (while creating DASQuery)

Input query contains a wild-card statement which is ambiguous:
Dataset value requires 3 slashes. The query matches these dataset patterns:
/*/*Zmm*/*
/*Zmm*/*/*

Suggested queries:
    dataset=/*/*Zmm*/*
    dataset=/*Zmm*/*/*

For easier query debuging, please use the DAS web interface first.
```
```
$ python ~/das_client.py --host=http://localhost:8212 --query="dataset=*relvalZmm*"
status: fail, reason: Can not interpret the query (while creating DASQuery)

Input query contains a wild-card statement which is ambiguous:
Dataset value requires 3 slashes. The query matches one dataset pattern in our cache, but please check if this is what you intended:
/relvalZmm*/*/*

Suggested queries:
    dataset=/relvalZmm*/*/*

For easier query debuging, please use the DAS web interface first.
vidma@vidma-laptop:/storage/DAS/DAS_code/DAS$ 

```