Implement, for the R glue only, reentrant variants of the IGRAPH_FINALLY* API:
- Declare a stack local to the function with a new
IGRAPH_LOCAL_FINALLY_STACK macro
- IGRAPH_LOCAL_* variants of the API that operate on the local stack
- Rewrite all functions in
interface_extra.c to use the new API
- Adapt Stimulus to emit the new API, run code generation
Implement, for the R glue only, reentrant variants of the IGRAPH_FINALLY* API:
IGRAPH_LOCAL_FINALLY_STACKmacrointerface_extra.cto use the new API