devpanel: fix crash on inspecting svg elements
test for basis.layout.getViewportRect added
field.js: fix url regexp
Calendar test for issue https://github.com/basisjs/basisjs/issues/16
init work on ui inspect
use separate basis.js instance for devpanel, use unique basisTemplateId marker per basis.js instance
Merge branch 'devpanel-ui-inspect' into devpanel-rework
replace basis.require for local require, various small fixes
devpanel: init implementation of view inspector
remove debug values from global
add basis.ui.GroupingNode to debug_notifier
devpanel: ui grouping
devpanel: highlight dom fragment on view hover
ui.calendar: rework section node creation and small refactoring (fixes #16)
layout: fix getViewportRect adds page scroll offset twice
1.2.3
Merge branch '1.2.3'
Merge branch 'master' into 1.3.0

Conflicts:
	src/basis.js
data.dataset.Subtract: use resolveDataset for minuend and subtrahend
basis.ui.calendar: deprecate Calendar#sections, manipulate sections by childNodes now