Using NK reduction scripts

	- collection of perl scripts to implement a 'pipeline'
	for reducing data from CFH12K, SUPRIME etc

	- computation performed by 'imcat' commands (mainly c-progs).

	- scripts are still somewhat fluid, but becoming less so, 
	- perl is ideal for this type of problem

	- prerequisites for using NK scripts
	
		UNIX	- e.g. Kernighan+Pike, Unix Power Tools
		perl	- e.g. programming perl
		imcat	- 'man imcat' and http://www-nk.ifa.hawaii.edu/~kaiser/imcat

	- reduction proceeds in (at least) two phases
		- phase-1 
			- sky subtraction, flat fielding, masking
			- process one observing run at a time
		- phase-2
			- registration and image co-addition
			- process one target field at a time

	- most recent 'phase-1' scripts can be found in 
		cronus:/netdisks/galileo9/kaiser/12ksurvey/cfh0900/phase1

	- most recent 'phase-1' scripts can be found in 
		cronus:/netdisks/galileo9/kaiser/12ksurvey/phase2scripts

	- work directory organisation
		phase-1:
			/home/..../PROJECT/OBSRUN/phase1
		phase-2
			/home/.../PROJECT/TARGET
		where e.g. PROJECT=MACS, OBSRUN=subaru1200, TARGET=MACSJ2234

	- work directories live in home disk - permanent record - no big files
		DIARY files
		inventory files
		database files
		log files

	- database files 
		- 'require'ed by scripts to customise the action 
		- e.g.:
		chips.db	# define layout of mosaic for 12K, SUPRIME..
		scratch.db	# location of scratch directories
		.....
		- goal is that scripts will be read only - centralized - no
		camera, user, site specific parameters in the scripts

	- names lists
		- text files listing images for each possible image 
		type, target, filter

	- scratch directory organization
		- scratch.db defines the base-directories on master, slaves
		- mirrored structure on master, slaves for ease of switching.