Resolve "Fix and extend mutation mechanisms"

• Make bounds for m, f, s config-controllable
• low priority Add a mode parameter and allow specifying different lambdas to determine m, f, s?
• low priority Add an "inheritance factor" that determines in how far the mutations are based on the parent's properties
• low priority Make it possible to choose the parent species in a weighted fashion, i.e. depending on number of individuals (B_i/m_i) in a species
• Allow species close to the extinction threshold to also mutate ...
  • For problems observed with the previous behaviour, see Allhoff2015-repro.md
  • Allow random extinction ... might even take energy from environment to conserve energy (better than distorting the mutation process)
• low priority (Look up further extensions from Allhoff publications)

Remaining tasks are kept track of in #15 ...