Move submenus into viewport correctly.

The fix in #116 apparently broke this.
The positioning of elements inside the content-container div gets messed up in Firefox if we don't pad empty cells with a non breaking space. Add it here via CSS.
Merge pull request #121 from williamcoates/fix-firefox-td-content-container

Firefox bug fix
Use any view as split view divider
added endResize
...
Table headers have a minimum size and should no longer lose their labels when a thin column is used for sorting
#9631: Don't leave commented stuff hanging around
Merge pull request #123 from jmiettinen/jarkko-9631

Table headers should no longer lose their labels
Fix resizing of the row headers
Merge pull request #124 from jmiettinen/master

Fix resizing of column headers
Less Firefox-specific stuff: use the same box model as everywhere else
Merge pull request #122 from lofstrom/refactor_splitview

Use any view as split view divider
Chrome was off-by-one
Merge pull request #127 from jmiettinen/jarkko-9994-b

Less Firefox-specific stuff: use the same box model as everywhere else
 Re-align sort indicators