Allow creation of certificates at predetermined Work Unit values

[TessellateDataScience]

Is your feature request related to a problem?

This feature request is to improve the visibility of FAH to the public, essentially increasing engagement using 'soft marketing' techniques. Some initial consultation within the FAH donators group (on the forum) has been started, attempting to determine some 'majority rule' perspectives from small datasets (i.e trying to generalise).

Describe the Feature

This feature would allow donators to generate 'nicely'-numbered certificates. I know they can currently be created for arbitrary values, but this would allow more 'nice' value (such as 1000, 10000, etc) that would feel more normal (than odd values such as 953, for example).

Context

This feature would encourage me to display the certificate (i.e. marketing material) in my office, in the background, during meetings with clients/colleagues /etc. This is done to drive awareness of FAH to public, who know about it to a lesser degree than STEM-related professionals (https://theoryandpractice.citizenscienceassociation.org/article/10.5334/cstp.109/).

[TessellateDataScience]

Happy to attempt to implement this feature request (or variation of it).

[TessellateDataScience]

Realised rounding to nearest nice value is automatically done on creation.