MAINT: Fix typo in public API

By keeping both variants, we aim to full backwards compatibility.
The new variant does appear in the documentation, the mispelled
variant is missing from the documentation but has priority.

numpy/ma/mrecords.py

@@ -667,16 +667,17 @@ def openfile(fname):
     raise NotImplementedError("Wow, binary file")
 
 
-def fromtextfile(fname, delimitor=None, commentchar='#', missingchar='',
-                 varnames=None, vartypes=None):
+def fromtextfile(fname, delimiter=None, commentchar='#', missingchar='',
+                 varnames=None, vartypes=None,
+                 delimitor=None):  # mispelled for backwards compatibility
     """
     Creates a mrecarray from data stored in the file `filename`.
 
     Parameters
     ----------
     fname : {file name/handle}
         Handle of an opened file.
-    delimitor : {None, string}, optional
+    delimiter : {None, string}, optional
         Alphanumeric character used to separate columns in the file.
         If None, any (group of) white spacestring(s) will be used.
     commentchar : {'#', string}, optional
@@ -692,21 +693,24 @@ def fromtextfile(fname, delimitor=None, commentchar='#', missingchar='',
 
 
     Ultra simple: the varnames are in the header, one line"""
+    if delimitor is not None:
+        delimiter = delimitor
+
     # Try to open the file.
     ftext = openfile(fname)
 
     # Get the first non-empty line as the varnames
     while True:
         line = ftext.readline()
         firstline = line[:line.find(commentchar)].strip()
-        _varnames = firstline.split(delimitor)
+        _varnames = firstline.split(delimiter)
         if len(_varnames) > 1:
             break
     if varnames is None:
         varnames = _varnames
 
     # Get the data.
-    _variables = masked_array([line.strip().split(delimitor) for line in ftext
+    _variables = masked_array([line.strip().split(delimiter) for line in ftext
                                if line[0] != commentchar and len(line) > 1])
     (_, nfields) = _variables.shape
     ftext.close()

numpy/ma/tests/test_mrecords.py

@@ -468,7 +468,7 @@ def test_fromtextfile(self):
         with temppath() as path:
             with open(path, 'w') as f:
                 f.write(fcontent)
-            mrectxt = fromtextfile(path, delimitor=',', varnames='ABCDEFG')
+            mrectxt = fromtextfile(path, delimiter=',', varnames='ABCDEFG')
         assert_(isinstance(mrectxt, MaskedRecords))
         assert_equal(mrectxt.F, [1, 1, 1, 1])
         assert_equal(mrectxt.E._mask, [1, 1, 1, 1])