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This routine reads the user specifications for the receptor points. *
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Author: A. Stohl *
1 August 1996 *
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HSO, 14 August 2013: Added optional namelist input
PS, 2/2015: access= -> position=
PS, 6/2015: variable names, simplify code
PS, 3/2023: remove position=append, makes no sense for new file *
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Variables: * receptorarea area of dx*dy at location of receptor * receptorname names of receptors * xreceptor,yreceptor coordinates of receptor points * * Constants: * unitreceptor unit connected to file RECEPTORS * *
testing