Display and input of non-ASCII characters

[sebastian-r-schmidt]

Hi, as I'm based in Germany I played around with non-ASCII characters like äöüß in commit messages with the following results on a Ubuntu linux machine using qgis 2.14.7 and geogig 1.0 with openjdk 1.8.111

• Using geogig cli from the console, I can include non-ASCII chars into a commit message, and its displayed correctly when looking at the commit log.
• When looking at the web API (JSON), the non-ASCII chars are exported in UTF8 Encoding (seems to be okay).
• In the QGIS GUI the non-ASCII characters are displayed incorrectly. My single special non-ASCII char (as "ü") gets displayed as two chars.
• When doing a commit using non-ASCII Chars in the commit message these make their way into the geogig repo correctly, as you can check using the geogig cli. from the console. But they are displayed incorrectly on the QGIS GUI (2 chars, as above).

[gioman]

@sebastian-r-schmidt seems ok here with the latest revision code: