[Rd] RAqua R 1.8.0 (alpha)

[Stefano Iacus]

a new version of RAqua is now available.
The major change for developers is that libR.dylib is now inside 
/Applications/StartR.app/RAqua.app/Contents/Frameworks and at build 
time the linker sets this path as install-name for libR.dylib

This only happens if you configure with flag --with-aqua and, of 
course, it make sense only if you use make install-aqua.

If you don't use --with-aqua and a simple make install, essentially 
nothing changes wrt R 1.7.x

stefano