Wrap the error reporting function of ReadStat to provide more

[andreasnoack]

informative error messages.

julia> read_sas7bdat("brokenfile.sas7bdat")
ERROR: Error parsing brokenfile.sas7bdat: Unable to convert string to the requested encoding (invalid byte sequence)
Stacktrace:
 [1] error(s::String)
   @ Base ./error.jl:33
 [2] parse_data_file!(ds::ReadStatDataFrame, parser::Ptr{Nothing}, filename::String, filetype::Val{:sas7bdat})
   @ ReadStat ~/.julia/dev/ReadStat/src/ReadStat.jl:287
 [3] read_data_file(filename::String, filetype::Val{:sas7bdat})
   @ ReadStat ~/.julia/dev/ReadStat/src/ReadStat.jl:261
 [4] read_sas7bdat(filename::String)
   @ ReadStat ~/.julia/dev/ReadStat/src/ReadStat.jl:293
 [5] top-level scope
   @ REPL[5]:1

instead of just ERROR: Error parsing brokenfile.sas7bdat: 17

[davidanthoff]

Thanks!