Bug fixes

Fixed bug with material compositions not being updated when written to file (#470).
Fixed bug with appending and renumbering numbered objects from other MCNP problems (#466).
Fixed bug with dynamic typing and the parsers that only appear in edge cases (#461).
Fixed parser bug with having spaces in the start of the transform input for the fill of a cell (#479).
Fixed bug with trying to get trailing comments from non-existant parts of the syntax tree (#480).

Code Quality