Imio.helpers

-----------------

- Added appy.pod usecase for rgba().
[gbastien]
- Improved annotation code
[sgeulette]

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- Use `html` instead `xml` for `lxml.html.to_string` rendering `method`.
This avoids results like `<p><s></s></p>` turned to `<p><s/></p>`.
[gbastien]

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- Fixed bug in `catalog.addOrUpdateIndexes` where a new index was not reindexed
if it was added together with an already existing index.
[gbastien]
- Fixed bug in `xhtml.storeImagesLocally` when img uses a `resolveuid` and
starts with the `portal_url` (this is the case when using `uploadimage plugin`
in `collective.ckeditor`), it raised a NotFound error.
[gbastien]
- In `xhtml.storeImagesLocally`, keep the `scale` at the end of the URL using
`resolveuid` (like `resolveuid/content_uid/image_preview`).
[gbastien]
- Use `PyPDF2` instead deprecated `pyPdf` to insert barcode into PDF.
This solves `ValueError: invalid literal for int() with base 10: ''`.
[gbastien]

----------------

- Added appy.pod usecase for complex styles start/end on same paragraph.
[gbastien]
- Do not break in `xhtml.storeImagesLocally` when no `<img> src` found.
[gbastien]
- Add methods to manage annotations (Add and Remove).
[anuyens, odelaere]
- Added method to get annotation
[sgeulette]

----------------

- In `xhtml.storeImagesLocally`, take into account `<img> src`
that uses `resolveuid`. This is the case when using `collective.ckeditor` and
option `allow_link_byuid` is enabled.
[gbastien]
- Do not use `/* ... */` together with `https://` in helpers.js comment or
merged javascripts produce a wrong format and raise a JS comment unterminated
error in the browser.
[gbastien]

----------------

- Added method `testing_logger` to `testing.py` that enables logging into tests.
[gbastien]