replace direct xattrtool path with $XATTR in metadata3 test script

fix xattrtool path in metadata test scripts

fix crash in merge_tags() when one list was NULL

fix matches_tags_and

fix tag filter crash

port cmd_tagop() to ucx 3

change libxattr xattr_get() to return null-terminated strings

(0) -300 -100 -30 -10 -7 +7 +10 +30 tip

mercurial