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Add apropos() that defaults to showing what help() shows.
rename stringpatch to stringreplace

to avoid requiring admin rights in win32, see
https://cygwin.com/ml/cygwin/2014-03/msg00191.html
Merge pull request #7746 from tkelman/rename-stringpatch

rename stringpatch to stringreplace
prevent merging of type error code from different locations. fixes #7372
improve keyword argument syntax error. fixes #7743
Add sinpi and cospi to vectorized functions

sinpi and cospi were missing from the list of built-in vectorized functions. I have added them next to sin and cos respectively in the doc.
Merge pull request #7750 from gajjanag/patch-2

Add sinpi and cospi to vectorized functions