plugin_plus_py8 branch

​https://code.launchpad.net/~maddevelopers/mg5amcnlo/plugin_plus_py8/+merge/303947

report	status	assignee|
1	X
1.1
1.2
1.3
1.4
1.5
2	X
2.1
3
4
5
6
7
8
9
10	X
10.1
10.2
10.3
10.4
11
12
13	X
13.1
13.2
13.3
13.4
13.5
14
15
16
17
18	X
18.1
18.2
18.3
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39	X
39.1
39.2
39.3