Merge branch 'ht/doc'
* ht/doc:
Doc: New design, refactoring, and lots of documentation for blockdraw_wfo.
Extensions: (blockdraw_wfo) Added new arguments to some connection functions.
Doc: Adding upward navigation at the top of each page.
Adding <ul> lists to the documentation.
Dependencies must be collapsed.
Make sure .shext files are copied to build dir, and then installed.
Adding the 70% format for JPEG versions of example images.
Doc: Documentation for the bondgraph extension.
Extensions: (bondgraph) Minor changes.
Doc: Added default value for @labelmargin.
Lots of mistakes with the documentation of ahAngle for arrowheads.