input file and console command size limit (PR#7030)

Full_Name: j m
Version: 1.9.0
OS: Mac OsX 10.3.4
Submission from: (NULL) (130.79.19.4)


I noticed a 1024  characters size limit when entering R commands in the R
console 
or when calling R from the command line using something like

R $R_in_opts $r_inputfile $R_out_opts $r_outputfile