Appy 0.9.4

[pod]
- PdfImporter: create temp images with Ghostscript in the OS temp folder.
- Bugfix (calling imagemagick to perform a transformation on an included image).
- doc_importers::ImageImporter: bugfixes. doc_importers.py::getZopeImage: bugfix.
- xhtml2odt: removed default style AppyStandard (derived from Standard): use Standard style as direct parent for other Appy-specific styles.
- xhtml2odt: many small bugfixes.
- xhtml2odt: retrieve styles defined on 'p' tags within 'td' tags, that are removed from the result.
- xhtml2odt: support css attributes 'text-decoration', 'font-weight' and 'font-style'.
- Bugfix: custom styles generated by the styles_manager::StylesGenerator for 'p' and 'div' tags are now defined as children of the default Standard style.
- Bugfix with LibreOffice 5 that adds text:sender-initials tags within annotations.
- converter.py: allow to export a multi-sheet excel file as multiple CSV files (using outputType='csv*').

[gen]
- Created class appy.gen.Ui and an instance of it in Config.ui for customizing the user interface: banner, fonts, etc. Consequently, appy.css now contains Appy variables (syntax: |variableName|) that are resolved at web server startup from Ui fields.
- file.py:File::getBase64: bugfix.
- file.py: added method FileInfo::getExtension
- User interface:: the Appy message (yellow rectangle) has now a fixed position and always appears, even if the top of the page is not shown.
- pxTemplate: added hook 'pxLinksAfter' for defining additional links after the pages.
- jscalendar integration: bugfix.
- List field: bugfixes.
- Ref field: take Ref.sselect into account.
- Ref field: cell layout for Refs; bugfix when rendering ref fields within other ref fields.
- Pod field: added a new predefined layout (left-aligned).
- Pod field: added param raiseOnError (similar to pod's Renderer homonym parameter)
- Pod field: added parameter « action » allowing to define an action that executes when after a pod result is produced.
- All fields : added some predefined layouts of 'vd' type (view-description: for fields that need to display their description on view layouts.
- Computed field: method can now be a (statically or a method producing a) Search instance.
- LDAP: allow to test LDAP servers at Appy startup.
- Groups with 'grid' layout: bugfix (rendering of sub-groups within a 'grid' group).
- For every HTML page produced by Appy, get a content for tag html->header->title based on the currently shown object and page.
- More flashy IE8 warning and bugfixes for IE11.
- Added param Field.indexValue allowing to specify a method producing a value to index that may be different than the stored value.
- object.onEditEarly takes now a param.
- Allow to show/hide the login form.
- Added method Class.getLoginsHaving allowing to know what logins have a given local role on some object.
- Added the concept of 'authentication context'.
- workflow.py: added a method for modifying roles mentioned in workflow transitions.
- Removed unused persistent Tool fields (those fields became RAM-config fields).

[shared]
- dav.py: better error reporting.
- dav.py: the JSON decoder now converts JSON dicts into Python objects.
- Bugfix in the XML unmarshaller. Thanks Marc Dubrowski.
- google.py: first steps for calling the Web Services Google API, allowing to geocode addresses and compute distances between it.