Feature: report cdba server/client version

E.g.

```
cdba -h my-lab -l
```
Would return
```
board1 Very Cool Board (cdba 1.0-g1234abc)
```

Conversely, the server could log:

```
[x.yyyyyy] user User logged in from xx.yy.zz.aa (cdba-1.2-g4321def)
```