Create a "Testing Applications" subsection in devel-examples
Move existing "regtest / testnet" texts to the new subsection and link to it
Move Bitcoin Core setup instructions in devel-examples
Add a consistent introduction for devel-(guide/ref/examples)
Fix autocrossref.rb to not add links inside {% highlight %} code blocks
Apply various typos and text improvements (thanks @harding!)
Merge pull request #453 from bitcoin/develdocstesting

Create a "Testing Applications" subsection in devel-examples