[Rd] data editor freeze on empty data frame (PR#622)

[Peter Dalgaard BSA]

pd@blueberry.kubism.ku.dk writes:

> However, in the X version, this seems to cause the data editor to
> freeze as soon as one hits Enter after inserting data into the
> first cell. I haven't tried the Windows version yet.

Freezes the windows version as well, it seems. Also, the code for
editing factors using their numeric codes seems to have been broken in
1.1.0 (only converts back to factor if there are invalid levels). I'll
fix the latter.

[I'm also not happy with the code that autoinserts mistyped or
otherwise extraneous factor levels -- if they really are typos,
they'll be a pain to remove if one used fix(my.frame)! That
may be against policy to change in a patch release, though...]

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907
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