Absolute paths have been stored as strings on all platforms for a while,
but old Mac persistent descriptors (Base64-encoded opaque alias records)
could still exist in the DB. Additionally, relative paths for stored
files were stored as Mozilla-specific opaque strings rather than UTF-8
strings.
This adds a schema step to convert those to strings paths in the DB.
Since Mac persistent descriptors aren't converted if the file isn't
found, we still handle and (convert) old-style persistent descriptors if
necessary when reading paths from the DB.
This also moves path string handling -- converting a path to a prefixed
string for stored or base-dir-relative files -- to the
Zotero.Item#attachmentPath setter instead of save() so that reading it
back immediately returns the correct value. One consequence is that the
attachment link mode must now be set before setting the path.
Zotero.Item#getFile() is now deprecated in favor of getFilePath() and
getFilePathAsync() (which checks file existence).
Zotero.File.directoryContains() now takes string paths instead of files.
In Firefox 41, file: URIs can no longer be loaded (at least via Image)
from the hidden window on Windows/Linux, but chrome: URIs still work.
Not sure why I was using a file: URI to begin with.
If multiple collections are highlighted and none are in view, scroll to
the first one in the list.
The logic could be improved here a little more to scroll to the closest
collection instead of the first one, and also to scroll to a few rows
above or below the target.
This also fixes what was probably an incorrect highlight if there were
multiple collections and some had to be expanded first.
Also:
* _finalizeErase in Zotero.DataObject is now inheritable
* Call _initErase before starting a DB transaction
* removes Zotero.Libraries.add and Zotero.Libraries.remove (doesn't seem like this is used any more)
