D5763: Use floating point calculations for column sizes to avoid accumulating rounding errors

[David Faure]

dfaure created this revision.

TEST PLAN
  Starting and quitting kmail multiple times used to make the first column grow
  every time.

BRANCH
  Applications/17.04

REVISION DETAIL
  https://phabricator.kde.org/D5763

AFFECTED FILES
  messagelist/src/core/theme.cpp
  messagelist/src/core/theme.h
  messagelist/src/core/view.cpp

To: dfaure, mlaurent
Cc: #kde_pim
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