- factored out cdh calculation in adaptive mode to a function
- added a function for mapping user-given values between z and gradient
  positions in adaptive mode
- improved the adaptivity of the adaptive mode by using finer cdh with adaptive
  resolution


git-svn-id: svn://svn.code.sf.net/p/gwyddion/code@16667 25697fe4-d644-49b8-9d30-be5465f2adf3
- added an ‘unlabelled’ ticks mode in which interior ticks are drawn but
  without labels
- added a possibility to specify a non-linear axis tick position mapping
  function


git-svn-id: svn://svn.code.sf.net/p/gwyddion/code@16668 25697fe4-d644-49b8-9d30-be5465f2adf3
- use the ‘unlabelled’ false colour axis mapping style with adaptive ticks
  when the false colour mapping type is ‘adaptive’


git-svn-id: svn://svn.code.sf.net/p/gwyddion/code@16669 25697fe4-d644-49b8-9d30-be5465f2adf3
- more 2.39 news


git-svn-id: svn://svn.code.sf.net/p/gwyddion/code@16670 25697fe4-d644-49b8-9d30-be5465f2adf3