Fixes to H-Abstraction: Part 3

-changed the comment on O/H/OneDeN;O_pri_rad rule to correct source
(checked with bbuesser)
-changed the comment on N3d/H/NonDeC;O_pri_rad rule to correct source
(checked with bbuesser)

-changed "2 C" to "2 Cd" in definition of C_rad/CSCsS to make it a
subgroup of its parent (50 rules affected)
-changed "2 C" to "2 Cd" in definition of C_rad/CdCdCs to make it a
subgroup of its parent (57 rules affected)
-changed "2 C" to "2 Cd" in definition of C_rad/CSCs2 to make it a
subgroup of its parent (51 rules affected)
-changed "2 C" to "2 Cd" in definition of C_rad/CdCs2 to make it a
subgroup of its parent(57 rules affected)
-changed "2 C" to "2 Cd"in definition of C_rad/CdCsS to make it a
subgroup of its parent(50 rules affected)
   -in rules.py replaced 265 instances of "2    C  0 {1,S} {5,D}" with "2
   Cd  0 {1,S} {5,D}" (rules for above 5 changes)

-changed "2 C" to "2 Cd" in definition of CdCOCs to make it a subgroup of
its parent  (0 rules affected)
-changed "2 C" to "2 Cs" in definition of C_rad/H2/Cs\H\Cs\Cs|O to make it
subgroup of parent (6 rules affected)
-changed "1 C" to "1 Cd" and "3 C to 3 CO" in definition of
C/H2/CO\H/Cs\H3 to make it a subgroup of parent (1 rule affected)
-changed both C atoms to Ct in definition of C2b (affects 1 rule)