2020/11/23
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 Look in detail: what can be fixed: SOLO2 missing fixes:
 
 for 921,  3901036, 7038,  type 4: have 1 missings    yes   cycle 0
 for 923,  3900838, 7027,  type 4: have 1 missings   yes    cycle 8
 for 1020, 1901686, 7140,  type 4: have 1 missings   yes    cycle 270
 for 1045, 4901581, 7171,  type 4: have 2 missings   yes to both; icycles   227 233
 for 1069, 1901709, 7152,  type 4: have 1 missings   no
 for 1115, 4901721, 7261,  type 4: have 6 missings   no
 
 use f_fixpos4.m to address those.
 
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use f_fixpos5.m to check out these fixes with QC=4:
 
 SOLO2 S2A with QC=4:
 1005, 4901473, 7132, 4   1   (index, not cycle; so "1" is usually cycle 0)
 1025, 4901588, 7176, 4 138    fix elsewhere!!!
 1040, 4901478, 7088, 4   1 
 1041, 4901482, 7161, 4   1 
 1042, 4901481, 7117, 4   1 
 1043, 4901483, 7168, 4   1 
 1079, 4901628, 7205, 4   1 
 1085, 4901631, 7211, 4   1 
 1086, 4901629, 7208, 4   1 
 1089, 4901624, 7232, 4   1 
 1221, 4903059, 7511, 4   1
 
 ALTO with QC=4
 1215, 4903219, 11020, 5   1

also have a few SOLO1 floats with QC=4 
  687, 3900727,  850, 3   1 
  733, 1901004,  949, 3   1 
  753, 1901455,  969, 3   1 
  825, 4901282, 1038, 3 143 
  879, 1901559, 1070, 3 123 
 1065, 1901706, 1152, 3  71
 
 All these QC=4 cases were fine OTHER THAN 
1025, 4901588, 7176, 4 138    fix elsewhere!!!
I added that to the cases addressed in f_fixpos4.m