It has been empty for nearly all systems. People who used to put stuff
in config.h can still create a config.h on their own and inject
-include (gcc) or /FI (msvc) into their CPPFLAGS.

Just state the copyright and the project the files belong to. You can
then find the COPYING file for the whole project.

Also add a GRAPH_PROPERTY for the analysis state.

This also plugs liveness related memory leaks

[r27690]

	* benodes store the out register requirements in backend_info now
	  (this is work towards killing the register_requirement callbacks)
	* ir_graph has a pointer to beirg now
	* Other cleanups

[r26540]

[r26317]

[r23613]

[r22754]

[r17143]

It gets a beirg not an irg anymore

[r15560]

[r14508]

  - The liveness in the birg stays always the same
  - Invalidation is done with be_liveness_invalidate()
  - Each algo has to specify if it needs only liveness checks
      be_liveness_assure_chk()
    or the complete liveness sets for use with be_lv_foreach, etc.
      be_liveness_assure_sets()

* Adapted all the files to these changes
* made bessadestr.c liveness updating

[r14506]

  - it uses the new liveness checking algos in ana/irlivechk.h
  - value_dominates, etc. was erased from bera.h because it does not belong there

* bechordal.c features an experimental coloring (by defualt disabled by macro)
  which can color the routine in a single pass without building the "borders".
  A long term goal is to disable borders completely but they are used in other
  places, too.

* The 1st parameter of values_interfere is now a birg and not a be_lv_t. There
  is now a special routine lv_values_interfere() for those who want to use the
  computed liveness explicitly. changing the parameter makes it more easy to
  switch to other liveness implementations.

All other files were modified to respect the changes

[r13762]

unified .h #ifndef ... #define ...
changed some indenting
removed some unused code
removed beuses_t.h as unused header

[r13559]

[r13508]

- Started working on flags

[r12716]