August pending

[webdev778]

This is a pending branch. It will also include Rababa integration in a few hours

Further work on reversibility and documentation

• 736 - multi-line strings are now documented

• 732 - tests are now reversible and documented

• interscript/maps#11 - map testing is now documented
• added and documented a feature to dont_reverse a stage

[webdev778]

Rababa integration

• integrate Rababa (with documentation) (#735)
• add a facility to skip maps from being compiled if a compiler is incompatible
• add a facility to run tests only for a given compiler (interscript/maps#5)
• additionally move Testing new maps documentation to Map_Editing_Guide.adoc (interscript/maps#11)