ms tool


There is a huge amount of functionality within the ms tool.  From a
user point of view making several tasks from this would be useful.  This
would allow much of the lower level stuff to be hidden to avoid
confusion and assure that the ms is opened with correct parameters.

Functionality that the user needs to see, perhaps in the form of
individual tasks.  Here they are somewhat catagorized and important 
parameters (and sensible names) are shown.


Importers
~~~~~~~~~
fitstoms
	infile	[No default]
	outfile	[Default = <infile>.ms, with the .FITS removed]
	[obstype -- if this parameter is important then it needs to 
	 explained]
sdfitstoms
	infile	[No default]
	outfile	[Default = <infile>.ms, with the .FITS removed]

In the packaging I would add the VLA, ATCA/RPFITS, BIMA, ... fillers 
to this list.

Exporters
~~~~~~~~~
tofits
	infile	[No default]
	outfile	[Default = <infile>.FITS, with .ms removed]
	column	[Default = 'CORRECTED_DATA']
	standard data selection params
tosdfits
	infile	[No default]
	outfile	[Default = <infile>.FITS, with .ms removed]
	standard data selection params

information
~~~~~~~~~~~
lister
	infile	[No default]
	column	[Default = 'CORRECTED_DATA']
	standard data selection params
summary
	infile  [No default]
	verbose	[Default F]	(Or perhaps use prtlev?)
history
  * Note -- better if this same task applied to ms or im
	infile	[No default]
	starttime	[Default = -1]
	stoptime	[Default = -1]

ms management
~~~~~~~~~~~~~
split
	infile  [No default]
	outfile	[No default]
	column	[Default = 'CORRECTED_DATA' (Note -- different from toolkit) ]
	standard data selection params
	standard averaging params
concatenate
	infiles [No default, -- ideally accept any number of input files]
	outfile	[No default]
	freqtol	[Default = '1Hz']
	dirtol	[Default = '1mas']

processing
~~~~~~~~~~
continuumsub	(was uvlsf)
  * Note1: this "feels" out of place in the ms tool
  * Note2: Should operate only on one spwid at a time!  
	infile	[No default]
	spwid	[No default -- not not array, but single spwid!]
	fitchans  [No default]
	fitorder  [Default = 0]
	solint	[Default = 0.0]
	mode	[Default = 'subtract']


[standard data selection params]  (All options are ANDed together)
  * Note: defaults are all empty, ie no deselection
	starttime
	stoptime	[Should support a delta time here, ie +10m]
	antenna1
	antenna2
	uvmin		[Note -- either in km or klambda]
	uvmax
	spwid		[Vector of ints]
	fieldid		[selection by field number]
	source		[selection by source name]
	channels	[Vector of ints, ranges]
	stokes		
	taql

[standard averaging params]
	chanave		[Default = 1, accept -1 for full averaging]
	timeave		[Default = 0.0]
	uvave		[Average based on UV cell sizes]