General setup fixes for Oracle

Thanks @bartv2 and @bantu, merged and closed.

Add path encoding to public API.

Add update permissions hook to sharing

[ie8] Fix lazy CSS loading and missing borders in search dropdown

enable oracle testing by default

Move the upgrade logic to \OC\Updater

Add update permissions hook to sharing

fix insertIfNotExist return value, update doc and corresponding test

Icon cleanup

handle anonymous upload to reshared folder

Squashed commit of the following:

commit eed4b49cebcbcc252a75ed85097730b73213b0da
Author: Björn Schießle <schiessle@owncloud.com>
Date:   Mon Jul 8 10:03:23 2013 +0200

    initialize OC_Defaults only once

commit bf6f07ccc8fb87535a069ca341789a590cb187ee
Author: Björn Schießle <schiessle@owncloud.com>
Date:   Mon Jul 8 10:02:48 2013 +0200

    link to doc in error messages

commit ea61ee60e06ee98f2671aec1fdaff666c50f47c2
Merge: e41af3d 3c1308fb
Author: Björn Schießle <schiessle@owncloud.com>
Date:   Thu Jul 4 11:10:56 2013 +0200

    Merge branch 'master' into better-messages

commit e41af3d7bad26aa5ca9ab21ec7dcbadd3cfe5d4f
Author: Björn Schießle <schiessle@owncloud.com>
Date:   Thu Jul 4 11:10:41 2013 +0200

    move to non-static defaults.php

commit 9e4258b1905244bdf34943a825421f041cbed43d
Author: Björn Schießle <schiessle@owncloud.com>
Date:   Tue Jul 2 10:32:13 2013 +0200

    no sprintf here, lets t() handle it

commit fe1df349e248667a137f70d78b04225e5b42a111
Merge: d8f6859 cb5811bc
Author: Björn Schießle <schiessle@owncloud.com>
Date:   Mon Jul 1 11:13:38 2013 +0200

    Merge branch 'master' into better-messages

commit d8f68595df2dc0e0917d916cbde511ec5333010b
Author: Björn Schießle <schiessle@owncloud.com>
Date:   Mon Jul 1 11:10:57 2013 +0200

    use document base url from defaults.php

commit 6c5403748a45717125a2aa375550f05646317d72
Merge: bea6b1c 7b0e3e63
Author: Björn Schießle <schiessle@owncloud.com>
Date:   Mon Jul 1 11:00:15 2013 +0200

    Merge branch 'master' into better-messages

commit bea6b1c8a0968846065b9153e0a3f46a4e3245ee
Author: Jan-Christoph Borchardt <hey@jancborchardt.net>
Date:   Mon Jun 24 16:21:12 2013 +0200

    link to docs in WebDAV message, ref #3791

commit 3119b364a1094769e711283d1ce9014505f64ab9
Author: Jan-Christoph Borchardt <hey@jancborchardt.net>
Date:   Mon Jun 24 16:10:21 2013 +0200

    link to docs in error messages, fix #3819