libxo-1.4.0

• Two changes to encoder options:

  • encoder options may use plus or colon, but only one

  • encoder names can be specified as "@name"
    This results in the syntax:

    df --libxo @csv:no-header:leafs=name.available-blocks /

• If xo_set_program is called before xo_parse_args, honor the requested value

• add xo_errorn* function; repair newline-adding-on-xo_error bug

• test programs now use fixed name, since linux libtool prefixs "lt-"

• Fix "horse butt" comment in source code

• update test cases