TODO refactoring
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These refactoring bugs should be discussed and reviewed. Feedback is welcome

* typedef all function pointers, like in r_bp

* Review r_io API

* Remove some unnecesary libraries for the core
  - r_th is fun.. but not useful anymore.. we should use glib or any other threading library
  - move the source of r_th oustide r2

* Drop #if conditionals to use #ifdef ones
  - fits better with plan9 compiler
  - use getopt() p9-like macros

* Store version information in libraries ? debian claims for it

* rasm2 should be configurable at startup time to choose default arch (use environment?)

* correct result (R_TRUFAE), but with warnings (implement r_errno and r_errstr in r_util?)
  - Quantic errors ftw \o/

* Finish and import the spp's getopt owns implementation in r_util (like in p9)

* Rename __UNIX__ as __POSIX__

* Find a better name for r_buf_fread