IGNORED LINE column type not imported successfully

[kestrel99]

MLXTRAN files with a data item flagged with {use=ignoredline} throw a syntax error on import.

[CONTENT] syntax error:
================================================================================
:001: SUBJID = {use=identifier}
:002: TAD = {use=time}
:003: AMT = {use=amount}
:004: EVID = {use=eventidentifier}
:005: DV = {use=observation, name=y1, yname='1', type=continuous}
:006: DVID = {use=observationtype}
:007: BLQ = {use=censored}
:008: DOSE = {use=covariate, type=continuous}
:009: WT = {use=covariate, type=continuous}

[CONTENT] syntax error:
:010: FLAG = {use=ignoredline}
                  ^

[mattfidler]

This isn't exactly a reproducible example, but I think #23 fixes this.

[mattfidler]

Should be on CRAN with 0.0.4