Somehow, we have to accept that the maximum number of lines in an ini file fits
within an "int" (Qt does a mess in its types between long long and int for the
handling of line numbers)

This is obviously wrong (as reported by "xmllint --noout *.xml") and this
triggers a bug in Qt6.2.3 (see https://bugreports.qt.io/browse/QTBUG-101646)
that silently interrupts the parsing.

This is issue 887 and is unfortunately required in order to compile on Apple Arm
silicon...

Added the new MAX_DISTANCE parameter to the LIDW_LAPSE spatial interpolation and the new SMET_VERSIONING options

The CMakeLists.txt now (almost) supports both qt5 and qt6 (for qt6, qt5_add_translation must be replaced by the proper one). The compilation instructions were not up to date, they have been updated.

It has also been slightly renamed...

The search paths for the xml files has been improved in order to handle the case of symlinks to the binary