[do-not-merge] Allow Adding Noise on All Channels
This changes the DefaultDigitizer to not loop over PixelCharge
objects received from the transfer step, but over all pixel indices of the matrix. If a corresponding PixelCharge
is found, we continue as usual. If none is found, an empty (0e) PixelCharge
is generated.
This way we can get noise entries for channels which have not actually seen any signal.
@hwennlof comments welcome.