Wrong byte_pointer bug in line_editor.rb

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Description

I found in #574 that wrong byte_pointer is passed to auto_indent_proc.
When @line or @line_index is changed, Reline needs to recalculate @byte_pointer too.

Where is the bug?

I slightly searched line_editor.rb with regexp /@line_index [+-]= |@line = / and listed up methods which is not updating @byte_pointer.
These are suspicious methods

incremental_search_history
ed_search_prev_history
ed_search_next_history
ed_newline
ed_next_history
vi_histedit
vi_replace_char
insert_new_line
just_move_cursor
rerender_changed_current_line
process_auto_indent
generate_searcher
em_exchange_mark

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Fixed all of them in #614