Patch from Roger to fix CONECT record output

Test case:
obabel -:CS(=O)(=O)C -opdb
Before:
CONECT    1    2
CONECT    2    1    3    4    5
CONECT    2 ****Bug or almost bug****
CONECT    3    2
CONECT    4    2
CONECT    5    2
After:
CONECT    1    2
CONECT    2    1    3    4    5
CONECT    3    2
CONECT    4    2
CONECT    5    2

Note to self: Where is that patch (from Astex) for multiple bonds in CONECT records that I applied years ago? Something's up.