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- Managed resources within the analysis itself
- Let constbits take care of the obstack to store the bit information

Along the way:
- Simplified code to sharpen Cmp relations
- Do not remove unreachable code by using bit information anymore

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.

This makes it consistent with other firm analyse functions. Also removes
the unnecessary return value.

graph_properties are things that a transformation may destroy but which
can be easily recalculated.

graph_constraints are set after lowering phases have been running and
forbid certain constructs that no (later) transformation is allowed to construct

First it is unclear what is a good way to deconstruct a program into extended
basic blocks, also none of our optimizations works on extended basic
blocks.

It should only be used by construction algorithms

public functions are already documented in their headers, no need to
repeat the comment at the definition site.

The functionality already existed,
but this is necessary at more than on place.

only set block/phi inputs to bad to kill unreachable code, all other
code will be dead and removed anyway