[data import tool] [fix] use get_field method of model/doctype.py
[listview] [label] show appropriate tooltip for bar graph
[rename] [validation] validate new name given on rename and strip leading and trailing spaces
Merge branch 'master' into edge

Conflicts:
	core/page/data_import_tool/data_import_tool.py
Merge branch 'edge' of github.com:webnotes/wnframework into edge