Merge pull request #352 from mmklee/mem_sw

Fix memory leaks in factory
Updated SW test-suite (changes in normalizaion/ext_fields)
Python-related changes / OSX

add: Additional PYTHON flags
fix: Working around wrong python's 'LINKFORSHARED' on OSX
chg: deleted unneccessary swap
chg: moved some code from .h to .cc
chg: absBiFactorizeMain now also returns other factors
chg: added factorizationWRTDifferentSecondVars to header
chg: removed trailing spaces
chg: added decompress for absolute factors
chg: renamed facAbsFact.* to facAbsBiFact.*
chg: changes due to renaming
fix: compiler warnings about empty if
added: new absolute factorization for multivariate polys
chg: changes due to new abs factorization
chg: added more tests from absfact.lib to absbifact.tst
chg: changes to build system and Singular interface due to new routines
fix: includes and some typos
chg: fewer bivariate factorizations and removed  unnecessary test
chg: formatting and removed unnecessary function
chg: removed trailing spaces
fix: typo
fix: possible seg fault due to invalid eval point