[Rd] install_github and survival

[Therneau, Terry M., Ph.D.]

I treat CRAN as the main repository for survival, but I have also had a github 
(therneau/survival) version for a couple of years.  It has a vignette2 directory, for 
instance, that contains extra vignettes that either take too long to run or depend on 
other packages.  It also gets updated more often than CRAN (though those updates mght not 
be as well tested yet).

In any case, since it is there, people will of course run install_github against it.   
I've added a config script to do the one extra step necessary, but when I try 
install_github it fails.   I'm clearly doing something wrong.  If someone were willing to 
contribute a fix I would be most grateful.

survival3.1-0 is almost ready for CRAN, by the way.   Reverse dependency checks of hdnom 
turned up one last thing to repair...


Terry Therneau


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