v0.7.0

• Changed variable names:
  This is mainly because of inconsistencies and probable name clashes with the shorter names.
  To make it absolutely clear we are dealing with types we add the suffix _t. We also redefine the
  type names to the equivalence of the modules:
  • type(var) -> type(variable_t)
  • type(dict) -> type(dictionary_t)
• Added type(c_ptr) and type(c_funptr) to the handling. This allows dictionaries to be passed through to
  C using simple middle-layers. These are currently defaulting to have maximally 1 dimension in the variable_t.
• Changed global variables from DICT_ to DICTIONARY_ and similarly for VAR_ to have consistency in naming.