`passenger_sim` fails to produce images when numeric locale is set to "it_IT"

[albertocasagrande]

If numeric local is set to "it_IT", the command passenger_sim fails to produce coverage and VAF histogram images and shows the following error message:

multiplot> set origin 0,130000,0,110000
                              ^
           line 0: unexpected or unrecognized token: ,


multiplot> set origin 0,130000,0,110000
                              ^
           line 0: unexpected or unrecognized token: ,


multiplot> set yrange [0,000000:] noreverse
                        ^
           line 0: ':' or keyword 'to' expected