Fix issue 6064: Inline images don't display on KitKat

Eliminate the invocation of
WebSettings.setBlockNetworkImage(boolean flag),
thus maintaining the the default setting of "false".

On Android versions prior to KitKat, this setting has no
effect on inline image attachments loaded with content:
URIs.  Such images would load regardless.

With KitKat, this setting does have an effect -- a
setting of "true" will block image attachments loaded
with content: URIs.

By removing this call, K-9 Mail behaves the same on KitKat
as on earlier Android versions, and the behavior on earlier
versions is unchanged.
first pass at a changelog for 4.900
bump version to 4.900
Bumped manifest to 4.900
Bumped manifest to 4.900
Bumped manifest to 4.900
Disable pull-to-refresh when remote search is not allowed

Fixed issue 6151
Restore instance state in correct order

Fixes issue 5968