the 'dirty' field attribute has been removed

[Stephane Popinet]

Dear all,

Please note that, if you are using some old customised code in the
sandbox, you may have to fix it because in the latest release the
'dirty' field attribute has been removed. You may then get compilation
errors complaining about 'dirty' not being known.

See:

https://basilisk.fr/src/?history

and more specifically, this patch for how to fix this:

https://basilisk.fr/src/?changes=20260421161711

cheers,

Stephane