moved --stf switch from GENERAL to own analysis GENERALVALUES (details below)

GENERAL analysis:
- removed --stf switch
	* moved that analysis part to new analysis 'generalvalues'
	* reverted parts of commit d48099ccacfec42acc95770b7d2867cf552f3ed5 (scattering and tangling val
GENERALVALUES analysis:
- now contains the analysis that output all the metric values for tangling, scattering and nesting
	* there is also output of the merged set of values (each distinct #ifdef expression gets conside
- '--norewriteifdefs' switches the ability to NOT rewrite, e.g., nested #ifdefs as conjunction of in
	* #elif branches retain their expression
	* #else branches (negation of previous #if/#elif, otherwise) get unconsidered for scattering and
- made analysis available in cppstats.py and analysis.py