Add very basic test for multiplicative noise
Make sure all symbols have `real=True` to make substitution work. Fixes #242
Merge pull request #243 from brian-team/fix_issue_242

Fix issue 242
Fixes #244
Use parentheses when substituting negative constants in the code to avoid replacing `-C` by `--0.5`, for example.
Correct an outdated code example
[ci skip]
Fix an issue where upsampling could lead to an integer overflow in a long `TimedArray` with a large dt.
Fix the resizing of `DynamicArray1D` and add a couple of tests. Fixes #248
Remove the `allocate_array` function that isn't used anymore.
Merge branch 'master' of https://github.com/brian-team/brian2