initial/fixed tree+alignment support, part 1
Merge branch 'structalign' of https://github.com/statalign/statalign
into structalign

Conflicts:
	src/statalign/base/Mcmc.java
	src/statalign/base/Vertex.java
Merge branch 'structalign' of https://github.com/statalign/statalign.git into structalign
initial/fixed tree, part 2
Merge branch 'structalign' of https://github.com/statalign/statalign.git into structalign