elimination of subtraction and division operators is no longer
done before the entire optimisation cycle, but rather directly
before AL/DL and reversed immediately thereafter.

warnings and automatic adjustment of settings rather than errors
and compiler halt.

explicit.

fusion effective in AKD cases.

driver program. Hope the makefiles are not fully
screwed now...
this is to prepare the birth of sac4c...

bug #341. Also, this may make saa in annotated
style (see isaa.c) run in a little more cases
without crashing.

advanced styles by default. Activate at your own risk!

disabled by default. change the #define-s at
the start of isaa.c, but beware: there be mighty
bugs ahead!

svn status etc. should provide clean and readable output again.

Reactivated saa

optimisation cycle, in case we will again specialise during optimisations
in the future. The specialised functions hook is effectively treated 
like the duplicated special fundefs hook in DupTree.

the command line option if no later start is specified.

Syntax tree sanity checks activated by default in developer version
to indicate problems at an early stage.

of new_typecheck.

15125 (e.g. all my work) under #def, so they will
not be run if not explicitly enabled.
this causes way less crashes and bugs and stuff.

creates non-ssa-compliant code.

in traversal mechanism. These checks are intended as an intermediate
solution until -d treecheck works.

New functions in phase.c control optimisation cycles both tree and
function based rather than large sections of macro generated code.
This step improves maintenance and debugging properties of the phase
mechanism implementation.