Generate and update R documentation files

[blowekamp]

No description provided.

[blowekamp]

@richardbeare The regenerated R docs contains:

\%C++ includes: sitkZeroFluxNeumannPadImageFilter.h

Which R is giving errors like: ExtractImageFilter.Rd:38: All text must be in a section
Before the leading '' was not there. This seems related to 404bd6e, do you have any insights?

Thanks.

[richardbeare]

It must be - looks like escaping the % signs outside the sections is causing problems. When outside a section the % were functioning as latex comments and removing that text. Not sure how that problem got past last time, unless perhaps the R checking has improved.

[richardbeare]

I've made some changes available in https://github.com/richardbeare/SimpleITK/tree/RB_fix_rampant_escaping

The C++ include information isn't needed for R and isn't being placed in a relevant structure at moment. Best to stop it being generated. That branch is based on blowekamp:UpdateRdfiles