support the ls expand option also for projects

packages of linked projects can be listed using the expand option
Resolve PEP8 issue W291

* W291 trailing whitespace
Resolve PEP8 issue E231

* E231 missing whitespace after ':'
Resolve PEP8 issue E231

* E231 missing whitespace after ':'
Merge branch 'w291' of https://github.com/berendt/osc

Conflicts:
	osc/build.py

Resolved merge conflict.
Merge branch 'e231' of https://github.com/berendt/osc

Conflicts:
	osc/build.py
support groups in maintainership requests
- make it possible to list by given review states

it used the state always for request and review state before, which makes no sense.

makes the code a bit nicer as well hopefully as well
- prepare 0.147 release
open 0.148 development
- added NEWS entry for "speedup update of a project working copy"
add basic completion support for fish shell
fish shell completion: help arguments
Initialize variable 's_built' during image build.

Fixed images local build failure because of
uninitialized variable 's_built'.
- support new history including review history of OBS 2.6
 - display request priorities, if important or critical
 - add "osc rq priorize" command to re-priorize existing requests
 - allow also "osc rq ls" shortcut
- roll 0.148 release for new request history support
- fix description rendering in history elements
- fix crash with not existing priorities
- do_createrequest: remove --diff option

This never worked and makes no sense (IMHO): use "osc request" for things
like that.