sign_extend does zero extension for unsigned integer modes

[r8359]

[r8358]

[r8357]

[r8355]

[r8354]

[r8353]

 - allow only hidden conversion if the size and the mode sort is equal
   and two-complements arithmetic is used: practically this allows only
   signed/unsigned conversion
 - all other conversions (which are reinterpret cast) are forbidden yet

[r8352]

[r8351]

[r8350]

[r8349]

[r8348]

[r8345]

[r8344]

[r8343]

some code cleanup

[r8342]

[r8340]

[r8338]

[r8336]

[r8332]

 - use lists instead of sets
 - correctly handle multipli inline (fixed the "nodes are on wrong graph" problem)
 - BugFix: correctly detect arg_based nodes
 - can ignore runtime functions in leaf count

[r8331]

[r8330]

[r8327]

[r8326]

[r8325]

- Fixed Cond nodes lowering: =   must be removed from comparasion of high parts
- Add support for Psi nodes

[r8324]

[r8323]

[r8322]

[r8320]

[r8317]

firm_init_options() is now a separate function that reads the firm.ini and might parse command line parameters.
This is NOT anymore done in init_firm()

[r8315]

[r8313]

[r8312]

[r8311]

[r8310]

[r8309]

 - inlining erronously could not inline functions containing a Proj(x, 6) includes
   functions with more than 5 parameters and <> operator ...

[r8308]

[r8307]

[r8306]

[r8303]

[r8302]