
Version 0.7.3.

Changes since 0.7.2:

(1) It will scale all integer image data to Float32, if BSCALE/BZERO != 1/0.
    It will also expunge the BSCALE/BZERO keywords.

(2) Add the scale() method for ImageBaseHDU, so data can be scaled just
    before being written to the file.  It has the following arguments:

type:  	destination data type (string), e.g. Int32, Float32, UInt8, etc.

option: scaling scheme. if 'old', use the old BSCALE/BZERO values.  if
        'minmax', use the data range to fit into the full range of specified
	integer type.  Float destination data type will not be scaled for
	this option.

bscale/bzero: user specifiable BSCALE/BZERO values.  They overwrite the
	"option".

(3) Deal with data area resizing in 'update' mode.

(4) Make the data scaling (both input and output) faster and use less memory.

(5) Bug fix to make column name change takes effect for field.

(6) Bug fix to avoid exception if the key is not present in the header
    already. This affects (fixes) add_history(), add_comment(), and add_blank().

(7) Bug fix in __getattr__() in Card class.  The change made in 0.7.2 to
    rstrip the comment must be string type to avoid exception.


git-svn-id: 5305e2c1a78737cf7dd5f8f44e9bbbd00348fde7@45 ed100bfc-0583-0410-97f2-c26b58777a21

embray/PyFITS,embray/PyFITS,embray/PyFITS,embray/PyFITS,spacetelescope/PyFITS,spacetelescope/PyFITS