ivivc for R
 A data analysis tool for in vitro-in vivo correlation (IVIVC)
 
Update logs
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~ 11/21/2014 (v0.2.2)
   - switched from optim() to optimx();
   - added R version into output files;
   - fixed weighting scheme for nlsLM(); and
   - added CITATION file in the folder of 'inst'.
   
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~ 09/23/2014 (v0.2.1)
   - fixed nls.lm(...) in ffirst.lag();
   - modified DESCRIPTION; and
   - fixed description_version().

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~ 05/19/2014 (v0.2.0)
   - switched nls() to nlsLM() from package minpack.lm from this
     release; the default method 'LM' (the Levenberg-Marquardt 
     algorithm) is used like PKfit;
   - fixed some notations in the plot, such as R-sq notation in the plots;
   - updated DESCRIPTION - 'Description' by adding "Level A Correlation"; and
   - updated dataset in /extdata.
   
~ 10/25/2013 (v0.1.9)
   - fixed fitting algorithm with removing check();
   - fixed extdata with "dose once" for each MR dosage forms;
   - updated dataset in /extdata;
   - fixed output file names for test (demo) runs.

~ 09/24/2013 (v0.1.8)
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   - abandoned rgenoud from nonlinear fit;
   - moved sciplot, png, grid, rgenoud to Imports from Depends;
   - fixed some typos with spelling check;
   - fixed subj # check for inconsistent subj # between subj with PK
     parameters and subj in the in-vivo dataset;
   - provide a very brief user's guide (.pdf);
   - put all plots as one .pdf file; add two more libraries: 'png' and
     'grid';
   - put in-vitro & in-vivo plots all together with 'group=pH'; and
   - replace windows() to dev.new() for linux/unix-like OS.
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~ 04/17/2013
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   - improve script efficiencies with default setting file outputs.
   - add 'Tutorial' function from ivivc_demo() at top menu.
   - generate output files for "Tutorial'.
   - improve PKfit() working with ivivc.
   - add 'demo' folder.
   - try to add more output files.
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