StorageInfo is now compatible with the default behaviour of bin_op(..)

Before this commit, bin_op would have had to pop from the stack
and than put a new non-constant StorageInfo on top of it.
Now, StorageInfo behaves like an usual memory address as soon as an
address is set.
Generator supports generation of plus and minus operation
Parser generates plus and minus while parsing
Generator can generate product and div
Fixed wrong code in generation of subtraction
Generator can generate negation
Parser generates code of proddiv and prim (i.e. negation)
Generator can generate comparisons
Parser generates comparisons in maybecomp
Merge branch 'master' of github.com:leostrakosch/balanCompiler

Conflicts:
	src/compiler/parser/Parser.java

Updated method names.