- added support for even higher-res phase_res


git-svn-id: svn://svn.code.sf.net/p/gwyddion/code/trunk/gwyddion@16637 25697fe4-d644-49b8-9d30-be5465f2adf3
- print a warning with when unknown phase_res is encountered


git-svn-id: svn://svn.code.sf.net/p/gwyddion/code/trunk/gwyddion@16638 25697fe4-d644-49b8-9d30-be5465f2adf3