There might be more I wanted to add, but I don't remember.
I'll have to add those the way I did the first time,
compiling with -Werror until it works.
This pass is almost exclusively focused on the registry.
I'll have a few more for Fortran once I figure out how.

Inspiration: registry was segfaulting, so I tried fixing the warnings
in case it was one of those.  It didn't work, but it's worth doing
regardless.

Change compile flags back to what they were before.

Guard io.h #include to avoid Linux compilation failures.

Given how much space this provides at the moment, this had better not
run over.

Most likely the better solution is to look up functions
to copy or delete files directly.
I'm not sure where to look for those,
but I'm pretty sure they're not in the C standard.

I pushed it to another branch, so a PR version can get some eyes on it.

external/RSL_LITE implements these as int, so they need to be declared with int returns, not void.

Not quite all of them yet, but there's only one other, that one
without an existing named constant.

EDIT: There's about seventy left: I'll have to go through those again.

I think there's a way to pass this as a parameter to snprintf instead, but I don't remember what that is at the moment.

I looked up how to do this.  Apparently you just stick a star for the width and put the variable with the width before the variable you want to have that width.

grep -E -e '\[[[:digit:]]{2,}\]' *.[CcHhFf]*

Lots of unused variables, but I should be able to leave those for a bit.
Unused parameters would be a pain, so I'm leaving those.

I wanted to make it a short to save space in the strings based on this, but given the push to optimize for clarity that's less relevant.

…warnings-registry

Fix merge conflicts.

I made nChmOpts a short int to keep buffer size down.
Given the change to named constants, this is likely irrelevant.

On the other hand, it may currently max out at five.