Update to v0.5.0

[noelchalmers]

Lots of new goodies! Now completely memory leak-free, and valgrind-clean!

New Features 🔥

• New comm_t object to encapsulate all MPI
• Error handling via std::exceptions
• New memory<T>, deviceMemory<T>, and pinnedMemory<T> types
  • Memory management objects, with shallow copy semantics and automatic garbage collection
  • memory<T> is essentially a thin wrapper of std::shared_ptr<T[]>
  • deviceMemory<T> and pinnedMemory<T> are thin wrappers of occa::memory
• New device-aware gather scatter functionality in ogs library, replacing gslib
• New ParAdogs library for distributed parallel mesh partitioning
• Device/Host Timers

[codecov]

Codecov Report

Merging #78 (9068ad0) into master (22ccbfc) will increase coverage by 2.38%.
The diff coverage is 71.36%.

@@            Coverage Diff             @@
##           master      #78      +/-   ##
==========================================
+ Coverage   83.51%   85.89%   +2.38%     
==========================================
  Files         263      284      +21     
  Lines       21245    19891    -1354     
==========================================
- Hits        17743    17086     -657     
+ Misses       3502     2805     -697     

Impacted Files	Coverage Δ
include/operator.hpp	0.00% <0.00%> (ø)
include/parAlmond/parAlmondCoarseSolver.hpp	100.00% <ø> (+14.28%)	⬆️
include/parAlmond/parAlmondparCSR.hpp	100.00% <ø> (ø)
include/platform.hpp	88.70% <ø> (-11.30%)	⬇️
include/precon.hpp	90.00% <ø> (+10.00%)	⬆️
include/settings.hpp	92.85% <ø> (+14.28%)	⬆️
include/solver.hpp	4.16% <ø> (-3.53%)	⬇️
include/timeStepper.hpp	63.63% <ø> (-23.87%)	⬇️
libs/core/comm.cpp	100.00% <ø> (ø)
libs/core/exception.cpp	84.61% <ø> (ø)
... and 372 more

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