Fixes

• When changing between arc-line databases there is no longer a prompt to choose between old and new values of TUNE_WCAL_INDEX. This was a bug which would cause the program to crash if the user guessed `new' as the response to the prompt.
• A memory management problem causing a crash if the abort `!' option was used in Options 3, 6, or 11 had been removed.
• The parameter CENTRAL_ONUM can now be used, previously the value was forced to zero within the program.
• In Option 4, the slit setup can now be edited. Previously, each invocation of Option 4 would recalculate the settings. The settings can now be edited without this `reset' by setting PFL_MODE to the value E before starting the option.
• The program now reports an error when unable to successfully access an input file. The program reprompts the user. Previously the program would crash when trying to use `unaccessed' data.
• The `Path syntax' in the plotter is now correctly displayed.
• In browse mode in the plotter SPLINE traces are now supported. Previously POLY was assumed with unpredictable side-effects.
• Limits in plotter browse mode are now correctly enforced, avoiding common crashes.
• All advertised style options in the plotter now work.
• A bug in Option 3 (Trace clip), which would decrease the number of knots for a SPLINE fit by 2 on each invocation, has been removed.
• In Option 14 (Output results) the OSPECT output product can now be used without causing a crash.
• The conversion from air to vacuum wavelengths enabled by TUNE_AIRTOVAC is applied to the output data file when requested. Previously, the correction was applied to the reduction database wavelengths, not to the output file.
• A possible divide-by-zero error in Option 5 (Flat field) has been removed.
• A missing range check in Option 9.2, which might give rise to segmentation faults, has been removed.