Masking of GSL errors in IPython-PyROOT-ROOT

BTW: the solution of Error handling for the integrator function in Mathmore no longer works. Linking fails with

... test2_c_ACLiC_dict.o: In function `_GLOBAL__sub_I_test2_c_ACLiC_dict.cxx':
test2_c_ACLiC_dict.cxx:(.text.startup+0x43): undefined reference to `gsl_set_error_handler'
collect2: error: ld returned 1 exit status