added separated multi selectioni, fixed Enter at search mode
added _sf_print_current_line, C-a/C-e goto beginning/end
Added C-s (start/stop Visual mode, same as v in Vim mode)
Added search word line on noheader mode
Fixed visual mode: up/down/gg/G
Fixed default variables usage
(They could not be changed by export in shell, but now they are valid)

Updated header, add one line to No-Header mode for the search mode