Overview of changes in gcalctool 5.7.15

* Released a gcalctool tarball for GNOME 2.13.3.

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Overview of changes in gcalctool 5.7.14

* More work on bug #153854. Similar change to that made on 15th November 
  2005, this time for arithmetic operator precedence mode.

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Overview of changes in gcalctool 5.7.13

* Slight fixup for bug #157961. The toggling of the first bit in the
  bit panel wasn't working correctly. 

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Overview of changes in gcalctool 5.7.12

* More work on bug #153854
  If the user has completed a calculation and we are going to a
  new mode that is "compatible" with this one, then just change
  modes. Otherwise display a dialog warning the user that the
  current calculation will be cleared.

  Incompatible modes are:

  Scientific -> Basic
  Scientific -> Advanced
  Scientific -> Financial

  (unless we are in Scientific mode with Decimal numeric base and Fixed).

  These changes work nicely in non-arithmetic operator precedence mode.

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