`weechat-print-line': Rename arg SENDER to PREFIX. (M)

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Make `weechat-print-line' take keyword arguments

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Add comment. (M)

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
`weechat-print-line-data': Rename SENDER to PREFIX. (M)

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Store nickname in text properties.

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
Merge branch 'master' of github.com:the-kenny/weechat.el

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Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>