Adding upstream version 2.15.2.

Signed-off-by: Daniel Baumann <daniel@debian.org>

UPGRADE.md

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+# Upgrade
+
+This document contains the upgrade information between the major versions
+of DSC for the eventual breaking changes, please read CHANGES for the new
+features added.
+
+# From dsc-201502251630 to v2.0.0
+
+The `dsc-201502251630` was the last version release before the use of
+version numbering.
+
+## Install Paths
+
+Since the conform to FHS 3.0 paths have been changed but will only affect
+new installations where `configure` is not touched.
+
+In previous version `INSTALLDIR` was set to `/usr/local/dsc`, this is now
+controlled by Automake and `configure` using `--prefix=DIR` or individual
+path options as below.  See `configure --help` for information about default
+paths and how to control each of them.
+
+- `upload-*` scripts was previously installed in `$INSTALLDIR/libexec`,
+  is now installed in `$libexecdir/dsc`.
+- `dsc.conf.sample` was previously installed in `$INSTALLDIR/etc`, is now
+  installed in `$sysconfdir/dsc`.
+- `dsc` was previously installed in `$INSTALLDIR/bin`, is not installed
+  in `$bindir`.
+
+## Data Files Path
+
+The path to `dsc` data files that it output has been changed to
+`$localstatedir/lib/dsc` but only affects the path in `dsc.conf.sample`
+during installation.  If you use an old configuration then `dsc` will
+store the data files in the same path as before.  This can be controlled
+by `configure --with-data-dir=DIR`.
+
+## Configuration
+
+Dataset names have been made unique so `dsc` will not start if there are
+duplicates, you need to change the configuration so that all datasets
+are unique.
+
+The following indexers have been removed since they are only aliases:
+- `cip4_addr`, use `client` instead.
+- `cip4_net`, use `client_subnet` instead.
+- `d0_bit`, use `do_bit` instead.
+
+## Upload Scripts Deprecated
+
+Altho the upload scripts are still installed they are now considered
+deprecated and will be removed in future versions.
+
+The uploads scripts where constructed for the purpose of uploading `dsc`
+data to DNS-OARC and that is a very specific purpose that does not belong
+in a software repository.  It can be replaced by instructions specific for
+each organization that needs to do it.
+
+## PID File
+
+The PID file is now locked and `dsc` will not start if another process has
+it locked.