Log Message:
Update to 3.8

Changelog:
3.8: 2014-03-28
     New transcode command for moving metadata to UTF-8.
     New @dsc() function for selecting all descendants if a selection set.

3.7: 2014-03-15
     New --dedos option for filter command, to change \r\n line endings to \n.
     New append command for annotating comments.
     The 'b' search code has been changed to appropriately match non-commits.
     New form of 'graft' allows greater control over graft points.
     New =I selector to find non-UTF-8 commit metadata.
     Import stream comments led with # are preserved as passthroughs.
     Buggy text search of authors fields has been fixed.

3.6: 2014-02-19
     Major rewrite of the generic conversion makefile.
     Fixed a bug in the graft and unite commands, thanks to Ralf Schlatterbeck.

3.5: 2014-02-16
     Single fossil or tag names now select as if surrounded by <>.
     Fixed more bugs in debranch.

3.4: 2014-02-14
     @amp() function useful for logic-gating in conjunctive expressions.
     New 'assign' command allows precomputation of expensive selections.
     There's an 'unassign' as well.
     exec/eval facility for custom Python extensions.
     path rename has a --relax and --force options to deal with path collisions
     New --changelog option of coalesce can recognize FSF-style ChangeLog files.

3.3: 2014-02-11
     Set negation in selections with ~.
     @min() and @max() in selections.
     'define' by itself lists macros.
     New 'deletes' option in the remove command.