Out of place variable rate jump extensions

[ChrisRackauckas]

Fixes https://github.com/SciML/DifferentialEquations.jl/issues/923

But for some reason it fails because jumps is not a JumpSet?

[ChrisRackauckas]

@isaacsas variable rate jump tests are failing on the latest release?

[coveralls]

Pull Request Test Coverage Report for Build 3855281158

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 16 of 46 (34.78%) changed or added relevant lines in 2 files are covered.
• 8 unchanged lines in 5 files lost coverage.
• Overall coverage decreased (-0.4%) to 88.263%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/extended_jump_array.jl	1	5	20.0%
src/problem.jl	15	41	36.59%
<!--	Total:	16	46	34.78%	-->

Files with Coverage Reduction	New Missed Lines	%
src/aggregators/prioritytable.jl	1	86.86%
src/extended_jump_array.jl	1	27.03%
src/jumps.jl	1	84.54%
src/coupling.jl	2	78.18%
src/spatial/spatial_massaction_jump.jl	3	85.45%
<!--	Total:	8		-->

Totals
Change from base Build 3849180560:	-0.4%
Covered Lines:	2098
Relevant Lines:	2377

---

💛 - Coveralls

[ChrisRackauckas]

For some reason my local formatter is acting up so I'll merge, someone just needs to format some time.