1.50-a1
	- Changed some default configuration settings (crush.cfg, faint.cfg
	and deep.cfg) from the previous version.

	- MAP_SMOOTHING key -smooth= option have new values. Smoothing
	can appear at three stages, internally in the reduction (i) while
	initial source map is constructed, (ii) internally after faithful
	map construction is set and (iii) for the final map. Accordingly,
	the directive can be 'initial', 'faithful' and 'final' to determine
	which stage is set. Additionally 'internal' sets the first two internal
	stages at once, while 'always' sets all stages. The value 'none' or
	'off' disables all smoothing. Thus
		
		-smooth=internal:6.0
	
	will smooth both maps at both internal stages by 6.0 arcsec FWHM. 
	
	- Added robust estimnators for PixelOffsets, CorrelatedNoise,
	PixelDrifts, RowPolynomials, MUXOffsets and BlockCorrelations. These
	alternative estimators are based on medians, rather than weighted
	means, and consequently will be less biased by the presence of compact
	source structures in the data steam. The estimator to use can be 
	selected via the XXX_ESTIMATOR keys or -Exxx= option flags, where
	XXX or xxx stand ofr the model ID's just like in the XXX_TURN and 
	-Ixxx= keys and flags. The valid values are 'maximum-likelihood' or
	'robust'. E.g. to use robust estimators instead of the default
	maximum-likelihood ones for correlated noise estimation, you can 
	use either:
		CORRELATED_ESTIMATOR = robust
	configuratiuon key, or
		crush [...] -Ecorr=robust [...]
	option flag.		
	Robust estimators on BlockCorrelations may be desirable. However,
	these did not seem fully reliable, and therefore the default 
	maximum likelihood estimators are used instead.

	- Old regional correlation model is brough back under the alias of
	BlockCorrelations. This is a much faster way of estimating 
	correlations than the FFT based RegionalCorrelations. It also has 
	the ability of using robust estimators instead of maximum-likelihood 
	ones.

	- Improved error function integral estimation to use with significance
	estimation in 'detect' tool.

	- Very slight error in calculating the correlated noise uncertainties
	Does not effect reduction in any significant way.

	
