[PATCH] logformat annotation fixes

Currently note values printed with "%note" formating code, which
contain non alphanumeric characters, were quoted and quotes were then
escaped, resulting in bizarre logged rendition of empty or simple values
(often received from various helpers):
      %22-%22
      %22Default_Google%22
      %22pg13,US%22

This patch:
- does not use quotes to print annotations

- Allow system admin to define a separator to use for logged
annotations. The %note logformat accepts the following argument:
     [name][:separator]
The separator can be one of the ',' ';' or ':'. By default, multiple
note values are separated with "," and multiple notes are separated with
"\r\n". When logging named notes with %{name}note, the explicitly
configured separator is used between note values. When logging all notes
with %note, the explicitly configured separator is used between
individual notes. There is currently no way to specify both value and
notes separators when logging all notes with %note.

- Makes the Format::Token::data a struct (now is a union) and initialize
Format::Token::data data members in Format::Token::Token constructor.

This is a Measurement Factory project