shr_string_listCreateField(), but for any range

[samsrabin]

I need to create a field list for a range of values that does not begin with 1. This doesn't work with shr_string_listCreateField(), which uses the input numFields as the top of the range and 1 as the bottom. I suggest implementing a new function, shr_string_listCreateField_range(), which takes inputs of the bottom and top of the range.

I've already written this up in a fork and will submit a pull request shortly.