database: Identifier for plots in supporting information

[DunklesArchipel]

In some cases, a piece of supporting information is provided along with the published article. These do not have a separate DOI but can be found on the same page where the main work is published.

My spontaneous suggestion would be to use the same filename convention as for the main article with the suffix _si, i.e.
`mustermann_2021_potential_42_si'. I don't know how we should handle the bibfiles and source identifiers in the files though.

• Update Add schuett_2021_electrodeposition_20461 figure sf1_blue #30 once this discussion is more conclusive

[linuxrider]

I would just use the same identifier as for the paper itself since it is an integral part and mentioned in the paper text. The only question: where to put "si"
pajkossy_1996_impedance_209_si_f8a_a
pajkossy_1996_impedance_209_sif8a_a
pajkossy_1996_impedance_209_sf8a_a
pajkossy_1996_impedance_209_fsi8a_a

[DunklesArchipel]

I would just use the same identifier as for the paper itself since it is an integral part and mentioned in the paper text. The only question: where to put "si" pajkossy_1996_impedance_209_si_f8a_a pajkossy_1996_impedance_209_sif8a_a pajkossy_1996_impedance_209_sf8a_a pajkossy_1996_impedance_209_fsi8a_a

The option with ..._sf... looks great (supporting figure). 👍

[linuxrider]

Sometimes there are more than one SI file present possibly with the same figure numbers.

[DunklesArchipel]

Sometimes there are more than one SI file present possibly with the same figure numbers.

This is indeed problematic. For the first case in #30 I kept it the way as discussed above, but might have to be adapted later.