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Also choose a signed integer type which is more typical for offsets.

This reverts commit 5165321c.

lower_highlevel() is used by x10i.
Also, I'd argue we should rather deprecate lower_highlevel_graph
instead.

- Compound type selection is performed with Member
- Array indexing is performed with Sel
- Instead of the simpleSel constructor functions you can use the normal Member
  constructors now
- The concept of array element entities has been removed, Sel nodes just
  contain a pointer to the array type now.

This removes the strange entity/type duality and we get rid of union symconst_symbol.

It is not usefull for optimization in most languages:
- In C/C++ you can't really change the value of enum constants as casting
  from/to integer has to produce the expected results.
- In Java (and other OO languages) enum members are objects so the
  libfirm enumeration type can't be used there anyway

also move copy_const_value from typerep/entity to irgmod.

Nobody uses it currently, and it is a burden for everyone writing a new
pass.

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.

The lowering phase had a lower_bitfield parameter.
Instead of passing "true", the (e.g. EDG) frontends now must
set_irg_state(irg, IR_GRAPH_STATE_IMPLICIT_BITFIELD_MASKING).

This is necessary, because not only the lowering phase is affected.
Additionally, the load store optimisation should handle Sels differently.