- Fix an error in 
CovEst.2010OAS. 
- Function list is moved to README file.
 
- Following functions are added - 
CovEst.2003LW,
CovEst.2010OAS, CovEst.2010RBLW. 
- Functions for hypothesis tests are separated for clarity.
 
- Initialize the following documentation:
NEWS for keeping record of updates. 
README to briefly introduce the method.