add pageload timeout and windows handle function

get_selenium_pageload_timeout
set_selenium_pageload_timeout
select_window_by_handle
get_window_handles
get_current_window_handle
add current frame should not contain

current_frame_should_not_contain
add some functions in table cell element

click_element_at_table_cell
click_subelement_at_table_cell
get_index_in_table_column
get_index_in_table_row
add find in col

find_in_col
_search_index_in_locators
windows handle function

select_by_handle
get_window_handles
get_current_window_handle
add try finally

avoid the browser error
identify windows