A reimplementation of MaskedArray + MaskedRecords

[P GM]

Folks,
I updated the alternative implementation of MaskedArray on the wiki, mainly
to
correct a couple of bugs.
(http://projects.scipy.org/scipy/numpy/wiki/MaskedArray)

In addition, I attached another file, maskedrecordarray, which introduce a
new
class, MaskedRecord, as a subclass of recarray and MaskedArray. An instance
of this class accepts a recarray as data, and uses two masks: the
'recordmask' has as many entries as records in the array, each entry with
the
same fields as a record, but of boolean types, indicating whether a field is

masked or not; an entry is flagged as masked in the 'mask' array if at least

one field is masked. The 'mask' object is introduced mostly for compatibilty

with MaskedArray, only 'recordmask' is really useful.

A few examples in the file should give you an idea of what can be done. In
particular, you can define a new maskedrecord array as simply as ;
a = masked_record([('Alan',29,200.), ('Bill',31,260.0)],
dtype=[('name','S30'),('age',int_),('weight',float_)], mask=[(1,0,0),
(0,0,0)])

Note that maskedrecordarray is still quite experimental. As I'm not a
regular
user of records, I don't really know what should be implemented... The file
can be accessed at
http://projects.scipy.org/scipy/numpy/attachment/wiki/MaskedArray/maskedrecordarray.py

Once again, I need your comments and suggestions !

Thanks.
Pierre
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