To-do list for 1.0 release

[dpsanders]

To-do list for 1.0 release:

• fix display (cf. Changing the display of intervals #697) (breaking)
• export numtype. Rename it to boundtype?
• make a docstring for the module IntervalArithmetic detailing the defaults settings; e.g., we do not have C-set flavor, PowerMode is set to :fast, intervals are displayed in the inf-sup format (it may look like a wider interval than what is actually stored), IntervalRounding is set to :tight (rename it?)
• improve the docs:
  • Document isapprox #675
  • Document configure (wich solves Document PowerMode #674)
  • Document in behaviour #647
  • @exact/ExactReal
  • interval rounding modes
• set default speed for matrix multiplication to :fast (breaking)
• update CRlibm.jl and add it back as a dependency
• document interval rounding modes