minor doc changes
Merge branch 'master' into hans
New example to demonstrate 'map' feature and ragged arrays.
Disable try-error output tracing
pdf manual: How to disable tracing output.
Documentation of distributions under Modules, and remove outdated docs of
density namespace.
Merge branch 'master' into hans
Add Statistical toolbox to docs
Merge branch 'hans'
Merge branch 'workshop'