Nest subprojects inside of parent projects

[MyMothersHairdresser]

We can create subprojects in taskwarrior by doing stuff like:

task add project:jimbob.devel "do the thing"    // id:1
task add project:jimbob.plan "divine path to strong AI" //id:2

for the sake of better test, let's have some subtasks:

task add project:jimbob.plan "read intro AI textbook" //id:3
task 2 modify depends:3

when we list the projects, we see them nested: task projects

jimbob 3

devel 1 plan 2

however twdeps puts each distinct project string in separate project boxes, along the lines of: