use static for conversion routines integer <->factory
changes for alternate integer representation
removed cfName and related
print(ring/cring)
bugfixes for 583, 611, 632
Merge pull request #626 from surface-smoothers/fix.613

bugfix for ticket 613
fixing f3149e13175bee0d8ebd2653e9c18f2b0496ddbb (tr.613)
tests: print(ring/qring)
Merge pull request #627 from surface-smoothers/spielwiese

bugfixes for tickets 583, 611, 632
missing parts for dccf2b7858608f2bcc2740c336f09a1482164db8 (tr.583,611,632)
fix tr.635 (max-min is limited by 2^31)
test fix