Add check whether there are any duplicated id in conf file while generating ParamBank
Add check whether there are any duplicated id in conf file while
generating ParamBank

In case of duplicates, the null pointer is returned instead of the
param bank.

JPETTomography/j-pet-framework,JPETTomography/j-pet-framework,alexkernphysiker/j-pet-framework,alexkernphysiker/j-pet-framework,alexkernphysiker/j-pet-framework,alexkernphysiker/j-pet-framework,JPETTomography/j-pet-framework,alexkernphysiker/j-pet-framework