The warning about the mount point -- that it was in-use or
invalid -- had been separated from the drop-down by the
FSLabel field. Move it back, rename the variable for
clarity while we're at it.
- make the boxes expand, rather than stick to a minimum
size that doesn't align with other boxes in the dialog,
and which may be too small to contain the text they display.
When creating or editing a new formatted partition, allow
to set a filesystem label (16 chars maximum). Modify
the KPMHelpers to accept it as a new parameter. Partitions
created by default may get a meaningful label too.
The .ui files are all GPL-3.0-or-later style, but it's
slightly difficult to keep licensing information in them:
it's XML, so an XML comment might work, but there's no
guarantee that safe/load will preserve them.
Put the SPDX tags in the <author> tag, so that it's visible
in Qt Designer.
