Flatten git2cl submodule

tools/git2cl/README

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+git2cl
+======
+
+This is a quick'n'dirty tool to convert git logs to GNU ChangeLog
+format.
+
+The tool invokes 'git log' internally unless you pipe a log to it.
+Thus, typically you would use it as follows:
+
+...........................................................................
+jas@mocca:~/src/libtasn1$ git2cl > ChangeLog
+jas@mocca:~/src/libtasn1$
+...........................................................................
+
+If you don't want git2cl to invoke git log internally, you can use it
+as a pipe.  It needs a git log generated with --pretty --numstat and
+--summary.  You can use it as follows:
+
+...........................................................................
+jas@mocca:~/src/libtasn1$ git log --pretty --numstat --summary | ~/src/git2cl/git2cl > ChangeLog
+jas@mocca:~/src/libtasn1$
+...........................................................................
+
+The output format is specified by:
+
+link:http://www.gnu.org/prep/standards/html_node/Change-Logs.html[]
+
+My inspiration for writing this tool was the
+link:http://www.red-bean.com/cvs2cl/[cvs2cl] tool, which I have been
+using in several projects.  Replacing it was necessary to seriously
+consider switching from CVS to GIT for my projects.
+
+The canonical home page for git2cl is:
+link:http://josefsson.org/git2cl/[] and its repository can be found at
+link:http://repo.or.cz/w/git2cl.git[].
+
+Credits
+-------
+
+Luis Mondesi contributed several improvements.
+
+Support
+-------
+
+Try talking to mailto:simon@josefsson.org[Simon Josefsson].