remove looking for fink/macports
skip detect symmetry function on mac
remove extraneous parentheses
remove unused pdfile parameter from read_hybridization states
move ifdefs outside the leaf_attribute functions
be pedantic about C
remove unused variables and method parameters
Merge Structural Bioinformatics Lab changes
more const-correctness
compiler does not want to inline exta, so let  us not
Remove special case ignores of certain atom and residue types
reset errno before checking it in pdb reading functions