Including more reactions in generate chain script

[shimwell]

We have some nice scripts that use openmc.depletion to generate chain files.

The scripts like generate_endf71_chain.py call the Chain.from_endf

This class method has default arguments for the reactions which are reactions=('(n,2n)', '(n,3n)', '(n,4n)', '(n,gamma)', '(n,p)', '(n,a)'),

We call this method with out specifying reactions so therefore we make use of the defaults.

Should we instead add lots of reactions so that the chain file represents all the possible reactions?