3.1 Feature Beta: Make / Ensure

Adds Make and Ensure, using a path specification to create or extend YAML data.

Multiple issues detected in this release (affecting earlier ones, too):

• My use of node building runs into issues with the yaml-cpp memory management: there's no real leak at the end of the program, but some operations tend to acculumate memory (and slow down significantly).

• Error handling / diagnostics is inconsistent and needs cleanup. I still fancy the idea to make extended diagnostics optional (since they may be too constly in a very very few scenarios). By now, this attempt only has led to awkward (internal) API's and scattered error handling.

• Ensure doesn't have much test coverage. It works, but maybe not always.

• doxygen documentation not included separately because it hasn't changed

3.0 - map filters!

Replaced seq-map filter with a more functional map filter. Updated documentation and YAPATE explorer utility

Release 2

• doxygen-docs.zip: doxygen-generated documentation
• yaml-path.zip: library only source code
• YAPATE.zip: a Windows x86 application for interactive demonstration and testing of yaml paths

Enjoy!