Add a test for combine and the use of two files with the same name in different directories

[parmentf]

When two files with the same names, but not in the same directory are
called, they should each have their own behaviour, not the one of the
first encountered file.

See this issue.

[parmentf]

I must have missed something, as I can't understand why the output I got is:

[ { "a": { "id": { "id": 1, "value": "a"}, "value": { "id": 1, "value": "a" } } } ]

instead of the (bugged) expected:

[{ "a": "a" }]

Whereas, if it worked well:

[{ "a": "b" }]

@touv , an idea ?

Precision: when I don't apply the second .ini file, the output is:

[{ "a": { "id": 1, "value": "a" } }]