Create an output file with the command line used to run the tool

[garikoitz]

Maybe we can do it in the same file where we output the config file. Let's talk tomorrow about the content of the output file:

• Datastring of the analysis
• Version of the docker container
• Version of the tool installed (AFNI version...)
• Config file used to invoke the Docker container
• Environment variables

[noahbenson]

Note: need to make sure that the docker version (which is already an argument to prfanalyze.sh) is also noted in the output file--can use the docker tag but also the docker unique id.