amoebabio18.prm missing torsion

[BJWiley233]

There is one torsion parameter that was added to tinker here that is missing from poltypes2's amoebabio18.prm for C-terminal threonines. There were actually 8 more updates as well since then so may we should just copy over the one Dr. Ponder has been updating? I am wondering how unlikely there are threonines at the C-terminal of proteins. Could be a good trivia question 😄.

Undefined Torsional Parameters :

 Type                        Atom Names                        Atom Classes

 Torsion      1852-C    1851-CA   1856-C    1857-OH         30    7    7   10