Better configurability of the aeroval pages

[AugustinMortier]

Right now, there is a default set of AeroVal pages rendered for each experiment:

• maps.php
• evaluation.php
• intercomp.php
• overall.php
• infos.php

This list is harcoded in AeroVal.

Now, there are two options in the config files within the webdisp_opts key:

• hide_pages
• add_pages

which are arrays made of the page names to be hidden or added
e.g:

"hide_pages": [
         "maps.php",
         "intercomp.php",
         "overall.php"
]

In order to clarify what will be available online eventually, it would better to have a single entry describing which pages are supposed to be rendered.
e.g:

"pages": ["maps", "evaluation", "intercomp", "overall", "infos"]

We suggest to use page "keys" ("evaluation") instead of page names ("evaluation.php") in case the pages are renamed later.
The mapping will be performed by AeroVal itself.

The suggested keys are:

• maps (default)
• evaluation (default)
• intercomp (default)
• overall (default)
• infos (default)
• cams2-82_reports (optional)
• cams2-83_reports (optional)