[alias] handle some outstanding issues and fix readout bug

Closes #1368, #1299, and #1309

See merge request frama-c/frama-c!4509

The readout reconstructed offsets in the wrong order.

This fixes tests/known_bugs/union_readback.c
Fixes #1368

The use of unions may lead to a crash in certain circumstances

Cyclic graphs may occur in the presence of unsafe casts.
Instead of crashing with an exception we continue with a warning.

Fixes #1299
Move tests/known_bugs/reduce_by_valid.c -> tests/fixed_bugs/reduce_by_valid.c

See https://git.frama-c.com/frama-c/frama-c/-/issues/1299

Contains heterogeneous casts that result in a cyclic graph leading to an
assertion failure and thus a crash.

Fixes #1309

All the variables printed by printf have been checked for coherence with
the calculated aliases.

Merge branch 'fix/martin/kernel/1243-kernel-comportement-erratique-de-l-iterateur-des-property-status' into 'master'

Resolve "[kernel] comportement erratique de l'itérateur des property status"

Closes #1243

See merge request frama-c/frama-c!4421

Adding option `-u` to frama-c-script led to an "unbound variable" error when
running `frama-c-script flamegraph`.

[ci] more targets

See merge request frama-c/frama-c!4184