Bigger tolerance on error message test for CellularSpace constructor.
Function execute() partially implemented in Lua level (#44). Currently, only parameters "-test", "-config-tests", "-ide" and "-mode" are implemented. Some of them will be reviewed.
Merge commit 'c491155e9bace1bcff7ca8d8bd07e58743654e10'

* commit 'c491155e9bace1bcff7ca8d8bd07e58743654e10': (25 commits)
  Tests now verify if there is some call to print(). #62
  Package functions moved to Package.lua #21
  incompatibleTypeError now gets the value as argument, instead of its type. #1
  Error and warning functions updated #1.
  Tests that produce the errors pointed by #70.
  Alternative tests for Map.
  Firsta unstable version of Map #17.
  Colors added.
  Minor bugs of UnitTest were removed.
  First (unstable) version for Map type.
  UnitTest:assert now accepts only true as valid value.
  print_error from UnitTest is now local.
  UnitTest documented #20
  Delay information added to the final report.
  Adding killAllObservers to the tests.
  Update on Chart for Society that now generates error necessary to check #63
  Adding delay to UnitTest #59
  Small update on checking tested functions.
  Type Clock added #57.
  Levels corrected to pass in all checks
  ...