gui: Add documentation of public functions.
authorAndre Noll <maan@tuebingen.mpg.de>
Sat, 6 Sep 2014 00:34:59 +0000 (02:34 +0200)
committerAndre Noll <maan@tuebingen.mpg.de>
Sat, 27 Sep 2014 23:02:00 +0000 (23:02 +0000)
The functions gsu_inputbox(), gsu_textbox() and gsu_msgbox() were not
documented at all. This commit adds summary, usage and a description
for each.


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