Resolved an issue in genfromtxt where it produced incorrect results whenever it was used all columns in usecols and they were in an order different than the displayed in the first line. Added a test to ensure accurate assignment of columns names to the respective columns. (fixes#28225).

The issue arose when usecols had all the column names but in different order than the one in the original text. In this case, usecols was not being reordered before assigning data, resulting in data being assign to the wrong column. The reordering only happened when the number of columns of the original text was more than the length of usecols. I just made it to reorder when they have same length too.