fixed order of fields in data frame schema for 2018 data

[MohammadAlavi1986]

The order of fields in 2018 daily attendance is as follows:

School DBN,Date,Enrolled,Absent,Present,Released
01M015,20180905,172,19,153,0
01M015,20180906,171,17,154,0
01M015,20180907,172,14,158,0

Unlike the other CSV files, Absent is followed by Present and this explains the absurdly high (over 90%) absenteeism.
By fixing the order of the fields, the list of schools with most absenteeism will become:

+--------+------------------+------------------+------------------+
|schoolId|      avg_enrolled|        avg_absent|                 %|
+--------+------------------+------------------+------------------+
|  10X476|179.33333333333334| 79.28439587128112| 44.21062966800062|
|  17K646|             240.0|105.67567567567568|44.031531531531535|
|  79Q607|             214.0|  92.5546218487395| 43.24982329380351|
|  79K957|             177.0| 74.23145161290323| 41.93867322762894|
|  79K665|            1128.0| 458.4076086956522|40.638972402096826|
+--------+------------------+------------------+------------------+