Many changes:2.0

- Item drill data is stored in a clearer format, each value has its own property, the old 'org-learn'
  LEARN_DATA property has been dropped. Items that contain LEARN_DATA are silently rolled over to
  the new format.
- For SM5, matrix of optimal factors is now correctly *global* rather than per-item, and is saved
  between drill sessions as an emacs customization variable.
- We store interval data as floating point numbers rather than rounding to the nearest integer.
- New experimental algorithm: 'simple8', based on SuperMemo SM8.
- New options:
  - org-drill-forgetting-index: define the percentage of items that it is "acceptable" to fail.
    A warning message is shown after the drill session if more items than this were failed.
  - org-drill-learn-fraction: governs how fast time intervals increase with each successful
    repetition of an item.
  - org-drill-adjust-intervals-for-early-and-late-repetitions-p: if true, alter next scheduled date
    if an item is reviewed earlier or later than it was supposed to be.
- Almost all variables have been declared safe for file-local reassignment.
- We now ignore org-learn-always-reschedule, regarding it as always true.
- Post-session report now shows a count of dormant items (those not yet due for review).

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