convert all remaining instances of chmod(2) to fchmod(2) ok stsp

there is no need to grab locks when opening refs in got_ref_delete()

make dangling symbolic references show up in 'got ref -l' Storing a resolved ID for each reference list item was a bad idea. This ID cannot be resolved if a symbolic references points to a reference which does not exist. Such symrefs were skipped by got ref -l as a result. Just let users of reference lists resolve the IDs as needed.

make 'got ref -d' delete both loose and packed representations of the reference

do not rely on <zlib.h> to pull in <unistd.h> ok stsp

cope with directory entries returned from readdir(3) with type DT_UNKNOWN Such directory entries need special handling to make our directory traversal code work on filesystems that do not support the d_type optimization. I found this problem because references stored in the refs/ directory were not shown by 'got log' and 'tog log' when a repository is mounted over NFS. helpful feedback + ok millert@

fix got_ref_change_symref(); it changed the ref's name instead of its target

handle refs/remotes/origin/HEAD properly; reported by Matthias aka _xhr_

allow for limiting output of 'got ref -l' to a single ref or a namespace

make replacing symrefs actually work in 'got fetch'

properly lock references when 'got fetch' needs to update them

make got_ref_list() work on a fresh repository created with got_repo_init()

allow 'got ref' to manipulate refs which do not have a slash in their name

move got_repo_cmp_tags() to got_ref_cmp_tags()

convert tree entries from SIMPLEQ to an array