ibrdtnd: new package

[Thomas:
  - add package to package/Config.in
  - remove "select" on libdaemon, libcurl, sqlite and openssl from
    Config.in, since those are optional dependency.
  - add "select" on ibrcommon, since it is a mandatory dependency.
  - remove bogus includes of package/ibrcommon/Config.in and
    package/ibrdtn/Config.in, those are directly from
    package/Config.in.
  - fix Config.in comment dependency and indentation.
  - remove INSTALL_STAGING = YES, since ibrdtnd does not install a
    library.
  - remove libdaemon, libcurl, sqlite and openssl as mandatory
    dependencies, and handle them as optional dependencies.
  - add ibrcommon in the dependencies (even if ibrdtn already depends
    on it)
  - remove custom INSTALL_STAGING_OPTS and INSTALL_TARGET_OPTS, they
    are not needed, since the Makefiles are properly generated by
    automake.
  - explicitly disable features for which Buildroot doesn't have the
    necessary dependencies (dtndht, wifip2p, vmime)
  - add hash file.]

Signed-off-by: Tom Sparks <tom_a_sparks@yahoo.com.au>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>