conditional assignment: ":= -if" (syntax only)
formatting
better AST for conditional assignment
mostly got rid of smart tabs
cmd_write: $format -> $string
got rid of what was left of smart tabs
got rid of get_value_for_printf()
fixed print_table flags
default is -ps
merged cmd_write and cmd_write1
cmd_additions -> get_additions (it's not a cmd)
skip -exec with {} for empty process list
disable assignment to system variables
fixed comment
grammar: `?` and `:` for conditional assignment
more remnants of smart tabs
extracted process_value() from process_arg()
process_arg: $rest[0] -> $rest