Improve representation of procedure pointers (fix #393) #399
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This was triggered by the fgen issue reported in #393. This looked first like the issue was simply that we did not account for the case that procedure information might be missing when generating the code for procedure declarations.
However, while trying to sort this out across frontends, I noticed that it should be perfectly possible to recognize the interface as a procedure in this situation, and that the handling of procedure types for symbols declared in procedure declarations was very inconsistent and partially wrong. This should fix this discrepancy.