Work around fparser bug

[hiker]

When lfric_atm is running transmute step, a transmuted ukca file will be parsed again by fparser (during the analysis step in Fab), which triggers a recursion error. See stfc/fparser#515 for details.

For now, I'll change the recursion limit in python when calling fparser to work around.

[hiker]

I verified that the original issue will go away with the release of PSyclone 3.3 (the current PSyclone 3.2.2 backend creates the deeply nested if else (if else (...)endif ) endif like structure. With 3.3, the code created will using elseif, i.e. only create a single if elseif elseif... endif statement. I have confirmed that the output of PSyclone master (soon to be 3.3) avoids the issue.

As such I suggest to leave this ticket open for documentation purposes, and close it with the release of PSyclone 3.3 (and not merge this into main, since by the time we will be merging lfric_atm, PSyclone 3.3 will have been release I think).