Character sets and eight bit data channel options

A number of channel options control handling of character sets in messages, as well as eight bit data.

See also the general topic of Character set conversion.

See also:
 * charset7 Option
 * charset8 Option
 * charsetesc Option
 * eightbit Option
 * eightnegotiate Option
 * eightstrict Option
 * headerset7 Option
 * headerset8 Option
 * headersetesc Option
 * parameterformatdefault Option
 * parameterformatminimizeencoded Option
 * parameterformatstripencoded Option
 * sevenbit Option
 * utf8header Option
 * utf8negotiate Option
 * utf8strict Option
 * Character set conversion
 * Functional group list of channel options