Apply big patch #101176 from Mario Frank

This one extended the findduplicatesview and fuzzysearchview with an
additional QSpinBox which denotes the maximum similarity. The new QSpinBox
has a minimum value that is the current value of the minimal similarity
threshold. When the minimum threshold is altered, the range of the new
QSpinBox is updated. If the minimum threshold is increased beyond the current
value of the new QSpinBox, the value of the new QSpinBox is increased
automatically. In the fuzzysearchview, altering the maximum similarity also
triggers the reuild of the similar images album. The extension can be highly
valuable if you knowingly want to ignore almost identical images but want to
find images that have a similarity of, let's say 50-60%, due to resizing,
cropping or something similar, without bloating your image pane.

BUGS: 369051
FIXED-IN: 5.4.0
CCMAIL: frank@uni-potsdam.de