fix incorrect stat flags on linux in metadata test scripts

compatibility with UCX 3.1 plus several minor code fixes ucx-3.1

add more xattr malloc checks

remove disabled realloc debug code from libxattr

improve xattr code

make sure a LocalResource path has never a trailing path separator, fixes multiple dav-sync tests

(0) -300 -100 -30 -10 -6 +6 +10 +30 tip

mercurial