Fix iteration.
Tidy up test case.
New branchesLoad method.
Fixes, but fails at insertR(11)
Fix divide on branches.
Tidy up.
Fix divide method.
Shorter variable names.
New GapSide class.
Add variance.
Add variance.  Remove use of Self type alias.
Move to org.livefx.gap package.
Remove "Gap" prefix.
Split into separate files.
New Trees type.
Replace usage of List[Tree[A]] with Trees[A].
Rename size to count.
New size method.
Remove redundant fields.
Tidy up.