some tweaks to get some compressed files working:
some tweaks to get some compressed files working:

these files were downloaded from
http://www.ars.usda.gov/Services/docs.htm?docid=23869
and previously not working. now they
successfully convert but inspecting the output data, it appears there are
several rows with junk data in them. if someone has the time to debug this and
fix the junk data lines, it would be much appreciated! here's the output after
the fixes in this commit:

[fped_0506.sas7bdat] ⟶ [fped_0506.csv] wrote 7723 of 7723 lines
[fped_0708.sas7bdat] ⟶ [fped_0708.csv] wrote 8076 of 8076 lines
[fped_0910.sas7bdat] ⟶ [fped_0910.csv] wrote 8190 of 8190 lines
[fped_dr1iff_0506.sas7bdat] 68.1% complete
[fped_dr1iff_0506.sas7bdat] ⟶ [fped_dr1iff_0506.csv] wrote 146940 of 146940
lines
[fped_dr1iff_0708.sas7bdat] 68.6% complete
[fped_dr1iff_0708.sas7bdat] ⟶ [fped_dr1iff_0708.csv] wrote 145703 of 145703
lines
[fped_dr1iff_0910.sas7bdat] 66.2% complete
[fped_dr1iff_0910.sas7bdat] ⟶ [fped_dr1iff_0910.csv] wrote 150991 of 150991
lines
[fped_dr1tot_0506.sas7bdat] ⟶ [fped_dr1tot_0506.csv] wrote 0 of 0 lines
[fped_dr1tot_0708.sas7bdat] ⟶ [fped_dr1tot_0708.csv] wrote 0 of 0 lines
[fped_dr1tot_0910.sas7bdat] ⟶ [fped_dr1tot_0910.csv] wrote 10253 of 10253 lines
[fped_dr2iff_0506.sas7bdat] 75.7% complete
[fped_dr2iff_0506.sas7bdat] ⟶ [fped_dr2iff_0506.csv] wrote 132151 of 132151
lines
[fped_dr2iff_0708.sas7bdat] 82.4% complete
[fped_dr2iff_0708.sas7bdat] ⟶ [fped_dr2iff_0708.csv] wrote 121341 of 121341
lines
[fped_dr2iff_0910.sas7bdat] 77.4% complete
[fped_dr2iff_0910.sas7bdat] ⟶ [fped_dr2iff_0910.csv] wrote 129141 of 129141
lines
[fped_dr2tot_0506.sas7bdat] ⟶ [fped_dr2tot_0506.csv] wrote 0 of 0 lines
[fped_dr2tot_0708.sas7bdat] ⟶ [fped_dr2tot_0708.csv] wrote 9762 of 9762 lines
[fped_dr2tot_0910.sas7bdat] ⟶ [fped_dr2tot_0910.csv] wrote 0 of 0 lines
[fpid_0506.sas7bdat] ⟶ [fpid_0506.csv] wrote 2744 of 2744 lines
[fpid_0708.sas7bdat] ⟶ [fpid_0708.csv] wrote 2852 of 2852 lines
[fpid_0910.sas7bdat] ⟶ [fpid_0910.csv] wrote 2947 of 2947 lines
Successfully converted 18 of 18 files

caot/sas7bdat