Eliminate bashism

'>&' is apparently a bashism, change '>& /dev/null' to '2>&1 > /dev/null'.

Problem reported by KatolaZ <katolaz@freaknet.org>.

Resolves #99 and closes #100.

README.md

@@ -12,6 +12,18 @@ copies some code from the mercurial sources.
 
 The current maintainer is Frej Drejhammar <frej.drejhammar@gmail.com>.
 
+Support
+-------
+
+If you have problems with hg-fast-export or have found a bug, please
+create an issue at the [github issue tracker]
+(https://github.com/frej/fast-export/issues). Before creating a new
+issue, check that your problem has not already been addressed in an
+already closed issue. Do not contact the maintainer directly unless
+you want to report a security bug. That way the next person having the
+same problem can benefit from the time spent solving the problem the
+first time.
+
 Usage
 -----
 

hg-fast-export.py

@@ -158,6 +158,7 @@ def sanitize_name(name,what="branch", mapping={}):
   # work to do manually, write a tool that does it for you.
 
   def dot(name):
+    if not name: return name
     if name[0] == '.': return '_'+name[1:]
     return name
 

hg-fast-export.sh

@@ -3,7 +3,22 @@
 # Copyright (c) 2007, 2008 Rocco Rutte <pdmef@gmx.net> and others.
 # License: MIT <http://www.opensource.org/licenses/mit-license.php>
 
-ROOT="$(dirname "$(which "$0")")"
+READLINK="readlink"
+if command -v greadlink > /dev/null; then
+  READLINK="greadlink" # Prefer greadlink over readlink
+fi
+
+if ! $READLINK -f "$(which "$0")" 2>&1 > /dev/null; then
+    ROOT="$(dirname "$(which "$0")")"
+    if [ ! -f "$ROOT/hg-fast-export.py" ] ; then
+	echo "hg-fast-exports requires a readlink implementation which knows" \
+	     " how to canonicalize paths in order to be called via a symlink."
+	exit 1
+    fi
+else
+    ROOT="$(dirname "$($READLINK -f "$(which "$0")")")"
+fi
+
 REPO=""
 PFX="hg2git"
 SFX_MAPPING="mapping"