Fix notification click behaviour for multiple accounts.

Test case:
- Have two accounts A and B
- Get a mail on A
- Get a mail on B
- Click on the notification for A

Result:
You end up seeing the message from B instead of A

The reason for that is that we need to register separate PendingIntents
for each account.
Issue 1911:  Permit folder names to wrap on multiple lines in folder list view so users can see the entire name.

Reduce the default font size used in folder list view to a reasonable size so that long folder paths wrap to fewer lines.
Create new preference option for wrapping folder names in folder list view.

Revert to using an ellipsized folder name as the default.
Permit the folder list item to expand vertically.

Prior to this, in cases where the folder name wraps to mulitiple lines,
it could overflow its box and the overflow was hidden.
Control wrapping of folder names programmatically only

This removes the default settings (ellipsized, single line) from the layout
xml file and implements them programmatically.  This fixes the problem where:
You are viewing a folder list while wrapping is currently on, then you go into settings
and turn wrapping off, after which you are back at the folder list, but the
list is still wrapped.
Readjust settings version number based on current master
Create action buttons to search for folders.
Provide new action bar "find folder" icons
Fix Issue 2389:  Self signed certificate expiry causes silent send/receive failure.

With this fix, a CertPathValidatorException or CertificateException will
create a "Certificate error:  Check your server settings" notification
in the status bar.  When the user clicks on the notification, they are
taken to the appropriate server settings screen where they can review their
settings and can accept a different server certificate.
Provide progress indicator for searches.

Searches can be slow, so users need an indicator.  The indicator is
also used when opening a message list or when refreshing it, or when
loading more messages.

This also removes some unused code.
Remove the progress bar from the message list footer.

More often than not, it's scrolled out of view.
Other progress indicators have been implemented that
are always in view.
Switch to using the action bar for folder searches.

Eliminate the old-style search dialog box.
Use a more appropriate title when diplaying folder search results.
Switch to using the action bar for folder searches.

Eliminate the old-style search dialog box.  A similar change
was previously made when searching from the folder list.  This
change is applicable when searching while choosing a
folder (e.g. a destination folder for a copy operation).
Eliminate unused code.
Merge branch 'wrap_folder_name_2' into folder_search

Conflicts:
	src/com/fsck/k9/activity/FolderList.java
Provide a progress indicator while loading remote search results.
Provide message search capability from the folder list.

The search is performed in all folders for the account
to which the folders belong.
Merge pull request #225 from maniac103/fix-multiaccount-notification

Fix notification click behaviour for multiple accounts.
Update Spanish translation (enriquefeas)