New config option to hide analysis path in report

[ewels]

It's not always desirable to show the path of the raw data in the MultiQC report. This could be sensitive, or just uninformative (eg. Nextflow temporary work directories).

The code that prints this is is in the header.html template file:
https://github.com/ewels/MultiQC/blob/063ac69e28d7b109cc9165d47c0d3f9de3f21e13/multiqc/templates/default/header.html#L62-L72

At the moment, the only way to remove this is to make a custom template. It would be pretty trivial to add a new boolean config option to allow this to be switched on and off though. We could even have two - one for the date, one for the path.

Also, looking at the above code I realise that it's missing a closing </p> tag.

[ewels]

Support now added via the following two config options:

show_analysis_paths: True
show_analysis_time: True

Set to False to disable either the analysis time or paths in the report header.