* scm/framework-ps.scm (write-preamble): use it to pick exactly

* scm/framework-ps.scm (write-preamble): use it to pick exactly
the right font from a Mac dfont.

* lily/ttf.cc (LY_DEFINE): ly:ttf-ps-name: new routine to extract
PS name from TTF font.

* input/regression/tie-manual.ly: document new feature.

* Documentation/topdocs/NEWS.tely (Top): add tie NEWS.

* VERSION (MY_PATCH_LEVEL): bump to .28

* Documentation/user/basic-notation.itely (Ties): add tie examples
refs.

* lily/tie-formatting-problem.cc (score_ties_configuration):
symmetry penalties for outer ties.