Verify creation of pages and movement to pages

[matsl]

What

Added or modified basic tests for creating pages and moving to pages
with sections. Misc new tests and refactoring of old tests. Update
hywiki to use sections.

Why

Moving to pages and section in pages is basic HyWiki functionality so
we need to cover that in our tests.

Note

Hywiki was missing using the sections with hpath:find. Added that in
order to write the test cases. Feel free to modify.

Rebased to use the update on the master branch.

[rswgnu]

An Action Key press on a WikiWord with just a trailing # should probably either go to the first Org doc section or trigger an error. What do you prefer?

[matsl]

An Action Key press on a WikiWord with just a trailing # should probably either go to the first Org doc section or trigger an error. What do you prefer?

I think it currently raises an error. (Hyperbole Action Key): No action defined for this context; try another location That is OK. Maybe just handle it as WikiWord would cause less questions from a user but will think about it.

[matsl]

Thinking more on this I think WikiWord# should be treated just like WikiWord#non-existing-section.

Currently we just move to the WikiWord-page if the section does not exists, There is an error message that the section can't be found. With an empty section we should do something similar. We could even strip of the hash mark and treat it as a normal WikiWord.

[rswgnu]

I think a wikiword that links to a page will display an existing buffer page with point wherever it was before the button was activated. We need a way to say, display the beginning or first section of the page, so this is as good a way as any.