add: rudimentary Bertone/Cheze/Galligo absolute factorization

Conflicts:

	factory/GNUmakefile.in
chg: deleted debug output from absfact
chg: documentation
chg: renamed fac_absfact.* to facAbsFact.*
chg: changes to output and documentation
chg: added absolute irreducibility test
chg: added new templates to hold absolute factors

Conflicts:

	factory/canonicalform.h
	factory/ftmpl_inst.cc
chg: changes due to new template
chg: added more functions to templates
chg: added naive implementations of abs. irred. tests from
     Bertone, Cheze, Galligo
chg: top level abs factorization interface
chg: debug output and experimental code
chg: convenient way to call absBiFact (i.e. handling of ring changes) via
     absBiFactorize
TODO: may be handle Gerhard's special output for absPrimDec
fix: univariate abs. factorization
chg: code clean up and optimizations
chg: docu + example
chg: docu
chg: more clean up
chg: changes due to rebasing
chg: some simplifications