[Automake-ng] Tagged first pre-alpha for Automake-NG

[Stefano Lattarini]

This will be especially useful to have 'git describe' return
more appropriate and informational strings; for example, after
the introduction of this tag and a further merge of master
into ng/master, the command:

  git describe ng/master

outputs:

  ng-0.5a-31-g01797e0

instead of:

  v1.11-2033-g01797e0

-*-*-

tag ng-0.5a
Tagger: Stefano Lattarini <address@hidden>
Date:   Tue Feb 21 15:32:38 2012 +0100

first pre-alpha version of Automake-NG (0.5a)
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commit f50c47007f45b32e67bbdf2289875f02f255e8bc
Author: Stefano Lattarini <address@hidden>
Date:   Tue Feb 21 15:23:28 2012 +0100

    [ng] fixup: version downgrade in 'm4/amversion.m4' as well

    * m4/amversion.m4 (AM_SET_CURRENT_AUTOMAKE_VERSION,
    AM_AUTOMAKE_VERSION): Downgrade Automake-NG version from 2.0a
    to 0.5a.  This should have been done in previous commit
    'v1.11-2001-g2684923' of17-02-2012, but we forgot to check in
    this part of the change.