Grounder restart

[paulbehofsics]

Adds reboots, that allow the removal of static nogoods. A reboot removes all except the minimum necessary static nogoods at some point during the search. This is done by resetting the solver and grounder and then replaying the same decisions as before to arrive at the same assignment. Included strategies for when to perform a reboot are experimental but the ANSWER strategy is the most promising so far. Reboots are disabled per default.

[codecov]

Codecov Report

Patch coverage: 82.33% and project coverage change: +0.18% 🎉

Comparison is base (2cce436) 78.87% compared to head (b383996) 79.06%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #361      +/-   ##
============================================
+ Coverage     78.87%   79.06%   +0.18%     
- Complexity      814      821       +7     
============================================
  Files           208      221      +13     
  Lines          8863     9299     +436     
  Branches       1495     1516      +21     
============================================
+ Hits           6991     7352     +361     
- Misses         1410     1474      +64     
- Partials        462      473      +11     

Files Changed	Coverage Δ
...a/at/ac/tuwien/kr/alpha/core/common/AtomStore.java	100.00% <ø> (ø)
...ac/tuwien/kr/alpha/core/solver/PerformanceLog.java	100.00% <ø> (ø)
...re/solver/heuristics/HeapOfActiveChoicePoints.java	96.29% <ø> (+6.64%)	⬆️
...olver/reboot/strategies/RebootStrategyFactory.java	12.50% <12.50%> (ø)
.../tuwien/kr/alpha/app/config/CommandLineParser.java	76.29% <48.21%> (-5.76%)	⬇️
...at/ac/tuwien/kr/alpha/api/config/SystemConfig.java	76.47% <59.25%> (-5.06%)	⬇️
.../kr/alpha/core/solver/NoGoodStoreAlphaRoaming.java	81.36% <75.00%> (-0.06%)	⬇️
.../ac/tuwien/kr/alpha/core/solver/ChoiceManager.java	80.32% <80.00%> (-0.93%)	⬇️
.../ac/tuwien/kr/alpha/core/solver/DefaultSolver.java	74.26% <81.30%> (+2.88%)	⬆️
...ien/kr/alpha/core/solver/reboot/RebootManager.java	82.85% <82.85%> (ø)
... and 29 more

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