Fixed mix of spaces and tabs in maintab.ui

Signed-off-by: Patrick Valsecchi <patrick@thus.ch>
Added salinity to the Dive Info tab.

Took the opportunity to remove some copy&paste.

Signed-off-by: Patrick Valsecchi <patrick@thus.ch>
subsurface-configure.pri: disable auto-"silent" mode for win32

Certain versions of mingw32-make will try to "CreateProcess"
passing the contents of CC and CXX. On win32, with CONFIG += silent
CC and CXX become composite containing multiple commands
such as "@echo... && gcc", which produces undesired results.

For the time being, do not automatically enable "silent" mode
if the current OS is win32. Possibly a better solution can be
found later on.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
subsurface-gen-version.pri: pass the current OS to get-version

We check the current OS and pass it as 'darwin' (osx), 'linux'
or 'win' to the get-version shell script.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>