The table of reliability results may be improved to identify accuracy problems

[mbaudin47]

In the example:

https://github.com/mbaudin47/otbenchmark/blob/master/examples/reliability_benchmark_table.ipynb

we see the results:

Some methods perform well, some not.
It should be possible to set the background color depending on the achieved number of digits:

• green: more than 2 digits,
• orange: 1 digit,
• red: 0 digit.