The github markdown interpreter has been changed such that it no longer
allows spaces in between the brackets and parenthesis of links and now
requires a newline in between anchors and other formatting. This
updates all of the markdown files accordingly.
While here, it also corrects a couple of inconsistencies in some of the
README.md files.
This introduces a new package to house tests which use the rpctest
package to programmatically drive end-to-end integration testing and
move the existing RPC integration tests into the new package.
