experimently implement replace mode for line up/down
now support right/left replace mode
dev
ok
now developping
refactoring
Merge branch 'master' into dev

Conflicts:
	autoload/textmanip.vim
	plugin/textmanip.vim
rewiten for stability robustly cleand up!!!
update
refactor
refactor
change var name
delete unnecessary lvar assignment
greatly improved, cleanup!!
in refactoring
refactor
refactored
refactored
refactoring and bugfix, stability improved!
update