- create AutoLoad env in system profile
- check for invoking .OptRequireMethods/.First/.First.sys/.Last
- remove handler-based setting of R options and align initial settings with GnuR
- create dummy .so files for utils and methods
- add -R:Rdebug option to allow debugging system profile functions

refactor RFFI, add 'native' project with Lapack shared libs; add La_rg and misc functions for eigen; implement R_PROFILE_SITE/R_PROFILE_USER evaluation on startup