Add 'Update software packages' to omv-firstaid. Use this or 'omv-update' instead of 'apt-get update; apt-get upgrade'.

git-svn-id: http://svn.code.sf.net/p/openmediavault/code/trunk@1013 3c3d7b80-5828-415e-9f61-280b98178fff
Various code improvements.

git-svn-id: http://svn.code.sf.net/p/openmediavault/code/trunk@1014 3c3d7b80-5828-415e-9f61-280b98178fff
* Add Exec::execBg RPC to execute a given RPC as background process
* Add -v command line argument to omv-mki18ndict

git-svn-id: http://svn.code.sf.net/p/openmediavault/code/trunk@1015 3c3d7b80-5828-415e-9f61-280b98178fff
Improve code.

git-svn-id: http://svn.code.sf.net/p/openmediavault/code/trunk@1016 3c3d7b80-5828-415e-9f61-280b98178fff