partial: 1.3.24.jcn

partial: 1.3.24.jcn

==========

* Added a ROADMAP file explaining the source directory layout.

* Minor tweak in the feta 6 and 9 numeral

* Moved files from lib/ to flower/

* Removed Note_head_side class.

* Updated the webpage to be a little more chatty.

* Small Local_key_engraver optimization: only lookup timing engraver once.

* Fixed dashed slurs

* Rewrite of Slur code.  Be much more picky about slur shapes. We try
to offset the slur instead of bending it too much

* Look at stem directions for tie direction.

* Compound multimeasure rests. Put measures_i_ variable in an element
property.  Made the symbol a lot wider.

* Time signature small cleanups.

1.3.22.h