summaryPDF: generates PDF report with summary of main results
Description
This function generates a PDF report that contains a plot of model performance across the alpha range,
followed by plots showing detailed results for each value of alpha.
# NOT RUN {data(QuickStartEx)
fit = eNetXplorer(x=QuickStartEx$predictor,y=QuickStartEx$response,
family="gaussian",n_run=20,n_perm_null=10,seed=111)
summaryPDF(x=fit,dest_dir=tempdir())
# }