Log Message:
Update to 0.12.17

Upstream changes:
Changes in Rcpp version 0.12.17 (2018-05-09)
Changes in Rcpp API:

The random number Generator class no longer inhreits from RNGScope (Kevin in \ 
#837 fixing #836).

A spurious parenthesis was removed to please gcc8 (Dirk fixing #841)

The optional Timer class header now undefines FALSE which was seen to have \ 
side-effects on some platforms (Romain in #847 fixing #846).

Optional StoragePolicy attributes now also work for string vectors (Romain in \ 
#850 fixing #849).

Changes in Rcpp Documentation:

A few old typesetting conventions from the prior Rnw format have been corrected \ 
(Peter Hickey in #831; Joris Meys; Dirk)

Two internal links to the introduction published in JSS have been updated to the \ 
changed filename given the newer TAS introduction.

Some remaining backticks were replaced with straight quotes (Ralf Stubner in #845).

A citation to the Rcpp introducion in the The American Statistician has been \ 
added to the introductory and FAQ vignettes.

Changes in Rcpp version 0.12.16 (2018-03-08)
Changes in Rcpp API:

Rcpp now sets and puts the RNG state upon each entry to an Rcpp function, \ 
ensuring that nested invocations of Rcpp functions manage the RNG state as \ 
expected (Kevin in #825 addressing #823).

The R::pythag wrapper has been commented out; the underlying function has been \ 
gone from R since 2.14.0, and ::hypot() (part of C99) is now used \ 
unconditionally for complex numbers (Dirk in #826).

The long long type can now be used on 64-bit Windows (Kevin in #811 and again in \ 
#829 addressing #804).

Changes in Rcpp Attributes:

Code generated with cppFunction() now uses .Call() directly (Kirill Mueller in \ 
#813 addressing #795).

Changes in Rcpp Documentation:

The Rcpp FAQ vignette is now indexed as 'Rcpp-FAQ'; a stale Gmane reference was \ 
removed and entry for getting compilers under Conda was added.

The top-level README.md now has a Support section.

The Rcpp.bib reference file was refreshed to current versions.