Revert " adding files mainly for the xls parsing"

This reverts commit e454021e54a5dfcf30db7acad561967a90f24ab3.

	deleted:    02_example.pl
	deleted:    03_example.pl
	deleted:    Files.pl
	deleted:    Files2.pl
	deleted:    data
	deleted:    example.pl
	deleted:    first.pl
	deleted:    fix_keyboard.pl
	deleted:    for.pl
	deleted:    header.txt
	deleted:    hello.bmp
	deleted:    parsetest.pl
	deleted:    perl_part_1.pl
	deleted:    perl_sdl_01.pl
	deleted:    perl_sdl_02.pl
	deleted:    perl_sdl_03.pl
	deleted:    perldoc_test.pl
	deleted:    progress_bar.pl
	deleted:    restart_pulse.pl
	deleted:    test.xls
	deleted:    text.txt
	deleted:    tut02.pl
	deleted:    tut03.pl
	deleted:    tut04_array.pl
	deleted:    xlsparse.pl
	deleted:    youtubedl.pl