Parameter default changes

• The default value of TUNE_MXSMP has been changed from 200 to 500. This reflects the increase in size of CCDs in recent years.
• The advertised default value of TUNE_TWTHR (0.9) was incorrect and has been corrected to 0.95.
• The advertised default value of TUNE_AUTLOC (YES) was incorrect and has been changed to NO.
• The advertised default value of TUNE_NPOLY (7) was incorrect and has been changed to 4.
• The default value of TUNE_ARCHIVE has been changed to NO.
• The default value of MIN_DISPERSION has been changed to 0.01 which better reflects the dispersions used in échelle instruments.