Add a misc subpackage in datasets for tools useful to several datasets

From: cdavid <cdavid@cb17146a-f446-4be1-a4f7-bd7c5bb65646>

git-svn-id: https://scikit-learn.svn.sourceforge.net/svnroot/scikit-learn/trunk@14 22fbfee3-77ab-4535-9bad-27d1bd3bc7d8

scikits/learn/datasets/misc/__init__.py

+from tools import dumpvar

scikits/learn/datasets/misc/tools.py

+#! /usr/bin/env python
+
+"""Some basic tools for common operations in datasets."""
+
+import textwrap
+
+def dumpvar(var, varname, wrap = 79):
+    """return a list of string representing the variable var with name varname.
+
+    For example, if var is [1, 2, 3, 4] and varname is l, this will return the
+    list ["l = [1, 2, 3, 4]"]. Each item in the list is a wrapped line, using
+    the value in wrap."""
+    strvar = varname + " = " + str(var)
+    l = [i + '\n' for i in textwrap.wrap(strvar, wrap)]
+    l.append('\n')
+    return l