documentation fixes

- migrate left over wikbook syntax
- fix xrefs
- set nowrap option on listing blocks showing CRaSH welcome message
- put anchors above sections
- fix lists that were being swallowed by preceding paragraph
- switch to CodeRay syntax highlighter
- set groovy language on Groovy listings
- enable section anchors
- use crash-version attribute for substituting library version
- use AsciiDoc include directives
- set sourcedir attribute for include directives
- add endlines in generator to space block elements