handle column select checkbox in block-way (entire cell clickable)
see 699e8e870a1adb5cfd5aac13e0000ce824484e00
make sure default_charset is empty for results without Content-Type header set
llke fkey browser (action=dobrowsefk) - overriding UTF-8 with server's default
repeat table header on bottom only when more results is shown
print bottom sort row with column names on last page with single result