Merge pull request #318 from brian-team/update_Brian_version

Use a license expression instead of a classifier

Update Ubuntu version for GitHub runner

fixup chrono

Interrupt hook (graceful stop with Ctrl+C)

Do not calculate elapsed time at every timestep

Use C++11 chrono library for time measurements

Remove test that is now part of Brian2 testsuite

Update to Brian 2.10.1

Update Brian2 submodule to version 2.10.1

Port changes for run_at/EventClock

Update Brian2 submodule to version 2.10.0

Synchronize test with corresponding test in Brian

Remove customizations that have become unnecessary

Update to Brian 2.8.0