Qrings: - BugFix #559
        - Added feature: constant in qring allowed: Stil in Work
Added qrings feature for constant in ideal
Added tests Tst/New/qring_with_constant
Forgot to rewrite the test New/qring_with_constant
Updated Short/ringmaps.tst since it has been added a nrnMapProjective from Z/p^s to Z/p^t with s > t
mv: moved the qring constant build into a function
add: cfQuot1
del: deleted not needed functions and chg names of functions
fix: factory/libfac/Makefile.am
update: Oleksandr Changes
Merge pull request #539 from adipopescu/QRings

Qrings