clear up some compiler warnings
First pass commit from Roger
add these temporarily
add some preconditions
mv PDBWriter to MolWriters.h
mv PDBParser.h code to FilePrasers.h
mv PDBSupplier.h code to MolSupplier.h
forgot a copyright update
add PDB input to python wrapper
rename MolToPDB, convert it to take a const ROMol &, and expose it via FileParsers.h
move kekulization into MolToPDBBlock
add pdb writer to wrapper
add PDBWriter to python wrapper
integrate Roger's bond-perception/assignment code
integrate Roger's bond-perception/assignment code
support sending molecules with more than 999 atoms to pymol
Merge branch 'master' into PDB_29September2013
remove the obsolete MONOMERINFO ifdefs
add in-place form of removeHs()
add in-place form of addHs()