add function: enable uniteSource__Gtags_Path with default format also
fix doc: fix typo s/Synatax/Syntax and itemize highlight
bugfix: link uniteSource__Gtags_Path to File as default
change spec: even if display [path] in path candidate, input string should not match with it in tree format.
bugfix: context.is_treelized should be initialized in on_init hook