Change in the detection flag

[MatthieuPE]

Before:

• the object must be detected in at least one band to be noted as detected
  After this update:
• the object must be detected in g AND r bands

[psferguson]

I think a linter would want a space between the operator and the parenthesis
)&( --> ) & (
but otherwise looks good!

[MatthieuPE]

I think a linter would want a space between the operator and the parenthesis )&( --> ) & ( but otherwise looks good!

Thanks for your feedback. I applied black format to the full file, that includes those additional spaces.