id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
1183	dettool -defineby... should require more things by default	eugene	eugene	"dettool -defineby.. functions require only a minimal amount of fields to be set.  Most of the restrictions (airmass, solangle, etc) are not normally going to be set, but a few should normally be set in some cases:

filter : any light-type of detrun (flat, fringe, etc?) should require a filter unless explicitly overridden (maybe with filter = any?).

time_begin : all detrend types should require a time_begin.  even if a large range is desired, it is better to force the user to think about the lower bound.

"	defect	new	normal		ippTools		normal