Fixes for intra_substitutionS_cyclization accessibility

-Changed all *4 R to *4 R!H because it always has at least 2 single bonds

-*3 subtree was overspecified for many groups. I have removed many of these groups and reduced the rest. This applies to all groups below CdsJ in that subtree

-S-RR *1 and *2 subtree is also overpecified for many groups, removed many of these groups the same way we treated the *3 subtree.

-Changed the following rules with indicated indices. They should all point to the original intent, but require less groups to do so:
2. XSR3J_S;SsJ-3-Cs;S-HC --> XSR3J_S_Cs;SsJ;S-H
3. XSR3J_S;CsJ-3-CsHH;S-HC --> XSR3J_S_Cs;CsJ-HH;S-H
4. XSR3J_S;CsJ-3-SsHH;S-HSs --> XSR3J_S_Ss;CsJ-HH;S-H
5. XSR3J_S;SsJ-3-Cs;S-Cs(HHH)C --> XSR3J_S_Ss;SsJ;S-H
6. XSR3J_S;CsJ-3-SsHH;S-Cs(HHH)Ss --> XSR3J_S_Ss;CsJ-HH;S-Cs(HHH)
7. XSR3J_S;CsJ-3-SsHH;S-Ss(H)Ss --> XSR3J_S_Ss;CsJ-HH;S-Ss(H)
8. XSR5J_SSS;CsJ-CsCsH;S-Cs(NonDe)C --> XSR5J_S_CsRCs;CsJ-CsH;S-Cs(NonDe)
9. XSR6J_SSSS;CsJ-CsCsH;S-Cs(NonDe)C --> XSR6J_S_CsRRCs;CsJ-CsH;S-Cs(NonDe)

-Added a few backbone groups to accomodate rule changes: XSR3J_S_Cs, XSR3J_S_Ss, XSR5J_SSS_CsRCs, XSR6J_SSSS_CsRRCs

Author: nyee