Redundant quoting of atoms

[triska]

One very small cosmetic issue I noticed: There is a tendency to use redundant single quotes for atoms. None of the atoms ., #, * etc. need to be quoted.

For example, it is perfectly valid to write a term V = vertex(X,Y,.) or T = f(#).

Single quotes have to be used for atoms like 'one atom'.

[aarroyoc]

Yeah, it's true. Sometimes I wanted to be extra sure :), I'll try to fix them later