Cython: Include support code in before_run block

[mstimberg]

Support code has to be included for before_run blocks, otherwise variables needed for functions that refer to namespaces (e.g. TimedArray) will not be correctly defined. This is a simple fix, in the longer run we should think about custom functions, namespaces etc. in before_run block. Currently, these blocks do not actually need any of all this, since they don't run user-defined code (but potentially that might change in the future?).

Fixes #1427, see https://brian.discourse.group/t/time-dependend-input-in-equation-vs-parameter/753/5 for example code that failed previously.

[mstimberg]

@schmitts the fix turned out to be almost trivial. Could you try out the fix_functions_namespace_cython branch with your code to confirm that it works correctly?

[thesamovar]

This looks fine to me! Not sure if you needed a review, but doing one anyway. 😉

[mstimberg]

This looks fine to me! Not sure if you needed a review, but doing one anyway. wink

Unsolicited reviews are the future 😉 Thanks!

[schmitts]

@schmitts the fix turned out to be almost trivial. Could you try out the fix_functions_namespace_cython branch with your code to confirm that it works correctly?

@mstimberg With the fix_functions_namespace_cython branch, the script works as expected also with the Cython backend.

[mstimberg]

Great, thanks @schmitts for the confirmation. Going ahead with the merge now (ignore the failed test runs, it's due to GitHub stopping support for the outdated OS X image we used previously, I already corrected this in master).