Issue 3561: Initial fix
Issue 3561 fixed for +,-,*,/
Changed procedures that deal with exceptions. Fixed error with limit function under the new rules for addition
Removed redundant include. Bug fixed.
Changed  precision to 1 for C.Float._new
Merge branch 'master' of https://github.com/sympy/sympy into issue-3561
Minor changes to already implemented procedured
refactor handling of special args
Merge pull request #1721 from smichr/issue-3561

Issue 3561