Generate a list of PAS images times from a list of input file names.

% pas_timelist --help  

Usage: pas_timelist list.in list.out N  
arg1 - input file listiing images  
arg2 - name of output time list file 
arg3 - run in debug mode (Y/N)

Example: 
% cat list.IMAGES
/home/sco/HET_work/gc_probes_0/20180828/acm/20180828T104221.3_acm_sci.fits
/home/sco/HET_work/gc_probes_0/20180828/acm/20180828T104715.2_acm_sci.fits
/home/sco/HET_work/gc_probes_0/20180828/acm/20180828T110621.6_acm_sci.fits
/home/sco/HET_work/gc_probes_0/20180828/acm/20180828T110428.2_acm_sci.fits

% pas_timelist  list.IMAGES List.Times N

% cat List.Times
1 38541.3 /home/sco/HET_work/gc_probes_0/20180828/acm/20180828T104221.3_acm_sci.fits 
2 38835.2 /home/sco/HET_work/gc_probes_0/20180828/acm/20180828T104715.2_acm_sci.fits 
3 39981.6 /home/sco/HET_work/gc_probes_0/20180828/acm/20180828T110621.6_acm_sci.fits 
4 39868.2 /home/sco/HET_work/gc_probes_0/20180828/acm/20180828T110428.2_acm_sci.fits