On Ubuntu host, build succeeded; but e.g. on Manjaro host, it failed with:
```
./build.sh: line 233: /opt/electrum/contrib/build-linux/appimage/../../../contrib/build-linux/appimage/.cache/appimage/appimagetool: No such file or directory
```
There was an issue where webbrowser.open would invoke a program like
kde-open5 that loaded the systems libQt5DBus, which was not satisfied
with the AppImage's libdbus. To fix this we fork the process, unset
LD_LIBRARY_PATH and then open the URL.
fixes#5425
-----
taken from Electron-Cash/Electron-Cash@00939aafd1c8e9c1cbf56615bcf9a18db1ff15c2
This slightly increases the AppImage size but allows us to be more
compatible with older distributions.
-----
taken from Electron-Cash/Electron-Cash@96644acd6fd66f866a86613974bb68bb99f00d8c
This suppresses the pip script location warnings, like we already
do for AppImage. It also disables the Wine debugging messages by
setting WINEDEBUG=-all.
-----
taken from Electron-Cash/Electron-Cash@d3685b038ef0dc3dc6a18345e51ff231c97623f5
It warns about scripts being installed in a location that is not on the
path, but that is inconsequential as they are not used.
-----
taken from Electron-Cash/Electron-Cash@9a29017c5d8906bb04f7e188bf483b0d3ff698f4
This seems to reduce anti-virus false positives.
based on:
Electron-Cash/Electron-Cash@1ac12e41114b509be90c75213829a73621f1610e
Electron-Cash/Electron-Cash@9726498e95166801ac1e6326ae5833b965df72e3
Electron-Cash/Electron-Cash@40b1139d67013b90b983dc3f9185a771d38e57ff
ran "appimagelint" and apparently icon file needs to be a square
(could have just created another copy, but I guess a square icon
might make sense in other cases too)
Triggering needs two consecutive scripthash status changes
in very quick succession. Client gets notification from server,
but then response to "blockchain.scripthash.get_history" will already contain
the changed-again history that has a different status.
20190627T101547.902638Z | INFO | synchronizer.[default_wallet] | receiving history mwXtx49BCGAiy4tU1r7MBX5VVLWSdtasCL 1
20190627T101547.903262Z | INFO | synchronizer.[default_wallet] | error: status mismatch: mwXtx49BCGAiy4tU1r7MBX5VVLWSdtasCL
SomberNight
ThomasV
Axel Gembe