Auto output naming for -xall, also overwrites by default

[zecanard]

When using the -xall option, NConvert outputs to an empty filename. To test, simply run:

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nconvert -out jpeg -xall test.png

on any test image.

The output is simply named:

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.jpg

I don’t know how difficult it would be to have NConvert use the input filename as the output for single-image inputs, without needing to specify -o %. For multi-image inputs, it could append 1, 2, etc. automatically, without having to specify -o % #

Furthermore, if you run the above command a second time, the existing file is overwritten, despite not specifying -overwrite.

I tested this under macOS v7.232.