Generalised row strategy to base strategy
Added arbitrary order strategy
refs #850
Fixed arbitrary order strategy declaration
Changed scanning-order type to string
refs #850
Changed strategy in main group in symboler
refs #850
Added naming pager's page (based on its id)
refs #850
Added page to scanning order
refs #850
Extended widgets documentstion
refs #865
Added style information to ProgressBar
refs #865
Added docs to Header widgets
refs #865
Added docs to BackgroundImage
refs #865
Added docs to BackgroundPatter
Changed visibility of drawing handler
refs #865
Added docs to Button widget
Finished docs in pisak.widgets
refs #865
Fixed param listing by adding newlines
refs #865
Params docs in correct form in speller widgets
refs #864
Merge branch 'master' into doc-extend

Conflicts:
	pisak/widgets.py
Merge branch 'master' of github.com:BrainTech/pisak
Merge branch 'master' into symboler-short-circuit-2

Conflicts:
	pisak/pager.py
	pisak/scanning.py

refs #858
Fix mergetool corruption
refs #858
Merge branch 'master' into groups-notify

Conflicts:
	pisak/scanning.py
refs #858
Fixed bad arguments in hasattr
Added group refreshing logic
refs #858
Added refreshing groups when stage changes
refs #858