importBrukerFlex: set verbose=FALSE

`MALDIquantForeign 0.4` produces verbose output now. To avoid long ugly lines overlapping the borders use `verbose=FALSE`.

default output of `importBrukerFlex`:
![snapshot1](https://f.cloud.github.com/assets/1828443/448384/7becb22a-b242-11e2-84c2-e89fc1e9f33d.png)

`verbose=FALSE`:
![snapshot2](https://f.cloud.github.com/assets/1828443/448400/1ff0cc6c-b243-11e2-82eb-8262fa9afe15.png)