Change spawn

[PanagiotisFytas]

Summary

This will change the way the scheduler spawns new processes. Specifically, a default of 50 process are getting spawned beforehand and when a new spawn is required the scheduler gets the new process from a pool of idle processes.

Checklist

• [ ] Has tests (or doesn't need them)
• [ ] Updates CHANGELOG (or too minor)
• [ ] References related Issues

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@6f09a23). Click here to learn what that means. The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #34   +/-   ##
=========================================
  Coverage          ?   93.62%           
=========================================
  Files             ?       12           
  Lines             ?     3406           
  Branches          ?        0           
=========================================
  Hits              ?     3189           
  Misses            ?      217           
  Partials          ?        0

Impacted Files	Coverage Δ
src/concuerror_generator.erl	100% <100%> (ø)
src/concuerror_callback.erl	92.56% <100%> (ø)
src/concuerror_options.erl	97.83% <100%> (ø)

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[aronisstav]

Excellent work! 👍 👍 👍

What I did:

• refactorings for your code that I pushed into this branch. If something's purpose is unclear, ask me and I'll be happy to explain.
• one final fix for Travis (increasing a limit for the failing test) that i did not push on change_spawn
• split out a few commits and sent them towards 'parapluu/master' (parapluu/Concuerror#249)
• squashed most of your work in one commit and made the 'max_processes' branch (bad name, but oh well)
• added a few more commits on top of 'max_processes'
• reset the https://github.com/aronisstav/Concuerror/tree/parallel branch. I will use it to track 'complete but not release-ready' work from the parallelisation project.
• opened pull request #37 for integrating 'max_processes' into 'parallel'.

It will be my responsibility to keep 'aronisstav/parallel' up to date with 'parapluu/master', whenever master advances. As soon as we start getting some benefit from the parallel version, I will start really merging 'aronisstav/parallel' into 'parapluu/master'. You should target 'aronisstav/parallel' in future pull requests (see it as 'your' master).

As a result, this pull request will not be merged. Please continue discussion in #37.