; Get the Concept for a text and source
;
; Input
;
; TEXT The search string (required)
; CDT Effective date (optional, default is TODAY)
; SUB Subset or 'hierarchy' (optional)
; SRC Code System source abbreviation
; LEXRAY Output array (optional, defaults to 'LEX')
;
; Output
;
; LEX or passed array name - an array containing information
; about the code
; LEX(0) - a five piece string:
; 1. code
; 2. hierarchy
; 3. version
; 4. legacy code
; 5. code status
;
; LEX("F") fully specified name ^ internal entry number
; LEX("P") preferred term ^ internal entry number
; LEX("S",n) synonyms (n is the nth synonym) ^ internal entry number
;
; otherwise
; "-1^error text"
;
; example of LEX array:
; LEX(0)="67922002^Substance^20050701^T-C2500^1"
; LEX("F")="Serum (Substance)"
; LEX("P")="Serum"
;