egs++ sources need better outputs to egslog file

[dworogers]

The output to the egslog file from various egs++ sources is lacking. There should be explicit information given. Also, referring to some quantity as fluence in the outputs is misleading. Better terminology is required. Also, absolutely essential to include what "distance"is used for the calculations. But also description of source shape and target shape would be helpful. I know its in the input file, but people often change input files after a given run so the info has to be in the .egslog or .egslst file.