refactor array read and update nodes into dedicated packages, move inner classes to respective package levels, remove obsolete class

Add pre-compiled native libs for Solaris (only tested on Solaris 11.1
x64) and fix the Makefile in com.oracle.truffle.r.native to correctly
compile on Solaris systems.

specialise for frame slot instead of name in RemoveAndAnswerNode (avoids repeated frame slot lookup)