Fix bug in display of parameter names violating the bounds condition
Check initial values for violation of inverse gamma prior

The inverse gamma distribution does not allow for the value 0, but the current check at the lower bound set LB=0 and tested for <LB instead of <=0.

Also fixes
Fixes bug in display of parameters at prior bound
Merge pull request #486 from JohannesPfeifer/prior_check

Check initial values for violation of inverse gamma prior