KLEE 3.1, 29 February 2024

Incorporating changes from 8 June 2023 to 29 February 2024.
Maintainers during this time span: @ccadar, @MartinNowack, @251.
Documentation at http://klee.github.io/releases/docs/v3.1

Major features and important changes

New execution tree implementation and klee-exec-tree tool (@251)
KDAlloc is now the default allocator in KLEE (KDAlloc was introduced in KLEE 3.0)
Resolve memory reads/writes to single objects in more cases (@tkuchta)
Concretize values based on seeds when available (@ccadar)
Fixed some interactions with external code (@ccadar, @MartinNowack, mishok2503)

New klee-exec-tree tool (@251)
New --write-exec-tree and --exec-tree-batch-size options (@251)
Renamed --compress-process-tree to --compress-exec-tree (@ccadar)
PTree is now called ExecutionTree in the code (@ccadar)
KDAlloc (--kdalloc) is now enabled by default (@ccadar)
Replaced --suppress-external-warnings and --all-external-warnings with --external-call-warnings=none|once-per-function|all (@ccadar)
Keep in the KLEE and Kleaver help menus only the KLEE/Kleaver option categories (@ccadar)
Removed --cex-cache-exp, a broken experimental optimisation for validity (@ccadar)
Removed --zero-seed-extension, and merge it with --allow-seed-extension (@ccadar)

Improvements to KDAlloc (@danielschemmel)
Avoid generating array names in solver builders that could accidently collide (@MartinNowack)
Function has_permission in the POSIX model now returns permission error a single time in symbolic execution mode (@ccadar)
Smaller refactorings, fixes and improvements, test cases, maintenance, comments, web version, website, etc. (@251, @ccadar, @dependabot, @danielschemmel, @davidtr1037, @jbuening, @marco6, @MartinNowack, @McSinyx, @sp1ff)