Infer `Variable.is_bool` from dtype instead of explicitly storing/providing it.
Rename `bool` to `boolean` in equations
Add a new preference `default_integer_dtype` and rename `default_scalar_dtype` to `default_float_dtype`.
Allow to use "integer" as the unit specification in equations. Closes #236
Add tests for integer variables and dtypes in general
Add a little note in the documentation about the declaration of dimensionless variables.
Merge pull request #241 from brian-team/int_as_unit

Integer variables in equations