- added mode recognition as an enum
- fixed units for force modes


git-svn-id: svn://svn.code.sf.net/p/gwyddion/code/trunk/gwyddion@16632 25697fe4-d644-49b8-9d30-be5465f2adf3
- trying to add an offset to LFM
- refer to modes symbolically, not as integers


git-svn-id: svn://svn.code.sf.net/p/gwyddion/code/trunk/gwyddion@16633 25697fe4-d644-49b8-9d30-be5465f2adf3