[Roxygen-devel] A few roxygen improvements

[Hadley Wickham]

Patches attached:

 1.  Don't switch working directories in collate.R

 2.  Use lapply instead of map, and eliminate some do.calls - this
decreases the stack depth and makes profiling much easier

 3.  Currently roxygen performs an exhaustive walk of function
expressions when it really only needs to get the assignee and formals.
 This patch is a quick (hacky) way to get just the info needed, and
speeds roxygen up 3 fold.

Hadley

-- 
http://had.co.nz/
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