to_date() month translation

Andrei Popov (andyelf@yahoo.com) reports a bug with a severity of 2
The lower the number the more severe it is.

Short Description
to_date() month translation

Long Description
When using to_date() format conversion with an arbitrary date-string, conversion mask description does not work as
expected,or as it works in most other databases where a similar function present. 

It is expected that when a date-string '12-January-2001' is fed to to_date() with mask 'DD-Month-YYYY' conversion
shouldresult in 2001-01-12::date.  See code sample 1 for actual result. 

Replacing 'Month' with 'Mmmmmmm' provides the correct result (see sample 2), but fails with '12-June-2001' (sample 3).
Blank-paddingmonth name to 6 characters works (sample 4) always but is (as severity suggests) a major annoyance. 

Sample Code
Sample 1:
---------

template1=# select to_date('12-January-2001','DD-Month-YYYY');
  to_date
------------
 0001-01-12
(1 row)

Sample 2:
---------

template1=# select to_date('12-January-2001','DD-Mmmmmmm-YYYY');
  to_date
------------
 2001-01-12
(1 row)

Sample 3:
---------

template1=# select to_date('12-June-2001','DD-Mmmmmmm-YYYY');
  to_date
------------
 0002-08-14
(1 row)

Sample 4:
---------

template1=# select to_date('12-January  -2001','DD-Month-YYYY');
  to_date
------------
 2001-01-12
(1 row)

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