add news item for git-annex 5.20151019

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+git-annex 5.20151019 released with [[!toggle text="these changes"]]
+[[!toggleable text="""
+   * Fix a longstanding, but unlikely to occur bug, where dropping
+     a file from a remote could race with other drops of the same file,
+     and result in all copies of its content being lost.
+   * git-annex-shell: Added lockcontent command, to prevent dropping of
+     a key's content. This is necessary due to the above bugfix.
+   * In some cases, the above bugfix changes what git-annex allows you to
+     drop:
+     - When a file is present in several special remotes,
+       but not in any accessible git repositories, dropping it from one of
+       the special remotes will now fail. Instead, the file has to be
+       moved from one of the special remotes to the git repository, and can
+       then safely be dropped from the git repository.
+     - If a git remote has too old a version of git-annex-shell installed,
+       git-annex won't trust it to hold onto a copy of a file when dropping
+       that file from the local git repository.
+   * Changed drop ordering when using git annex sync --content or the
+     assistant, to drop from remotes first and from the local repo last.
+     This works better with the behavior changes to drop in many cases.
+   * Do verification of checksums of annex objects downloaded from remotes.
+   * When annex objects are received into git repositories from other git
+     repos, their checksums are verified then too.
+   * To get the old, faster, behavior of not verifying checksums, set
+     annex.verify=false, or remote.<name>.annex-verify=false.
+   * setkey, rekey: These commands also now verify that the provided file
+     matches the expected checksum of the key, unless annex.verify=false.
+   * reinject: Already verified content; this can now be disabled by
+     setting annex.verify=false.
+   * sync, merge, assistant: When git merge failed for a reason other
+     than a conflicted merge, such as a crippled filesystem not allowing
+     particular characters in filenames, git-annex would make a merge commit
+     that could omit such files or otherwise be bad. Fixed by aborting the
+     whole merge process when git merge fails for any reason other than a
+     merge conflict.
+   * Allow building with S3 disabled again.
+   * Ported disk free space checking code to work on Solaris.
+   * Windows webapp: Fix support for entering password when setting
+     up a ssh remote.
+   * copy --auto was checking the wrong repo's preferred content.
+     (--from was checking what --to should, and vice-versa.)
+     Fixed this bug, which was introduced in version 5.20150727.
+   * Avoid unncessary write to the location log when a file is unlocked
+     and then added back with unchanged content.
+   * S3: Fix support for using https.
+   * Avoid displaying network transport warning when a ssh remote
+     does not yet have an annex.uuid set.
+   * Debian: Add torrent library to build-depends as it's packaged now,
+     and stop recommending bittornado | bittorrent.
+   * Debian: Remove build dependency on transformers library, as it is now
+     included in ghc.
+   * Debian: Remote menu file, since a desktop file is provided and
+     lintian says there can be only one."""]]
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