directory renaming

.github/workflows/pvs_prelude.yml

README.md

tools/.gitignore

tools/README.md

tools/bootstrap.sh

tools/lambdapi.mk

tools/lambdapi.pkg

tools/prelude/Makefile

tools/prelude/README.md

tools/prelude/divides.lp.sh

tools/prelude/mk_dummy.sh

tools/prelude/number_fields.lp.patch

tools/prelude/theories

tools/prelude_patches/01-functions.diff

tools/prelude_patches/02-orders.diff

tools/prelude_patches/03-sets.diff

tools/prelude_patches/04-sequences.diff

tools/prelude_patches/05-function_image.diff

tools/prelude_patches/patch-prelude.sh

tools/pvs2dk.sh