Firefox is using native checkboxes and in KDE the checkboxes have a
bigger height which caused the row height to increase and be misaligned
with the date column.

This fix makes the checkbox absolute to prevent it to influence the row
height.

fixes #6108

Having a too small widths for the files table doesn't make sense as it
overlaps file actions with the files themselves and make them
unclickable, especially when viewed on mobile phone.

The compromise that this fix introduces is to have a minimum width that
will trigger horizontal scrolling, which will at least make it possible
to click files on mobile phones.

- show tooltip when violating naming constraints while typing
- when target filename exists on server fallback to dialog to interrupt the users flow because something unexpected went wrong
- fixes #5062
- also fixes some whitespace and codestyle issues in files js
- uses css selector over filterAttr in touched js files

There was an issue where only Chrome allows setting position: relative
on a td element.

This fix now works in IE8, Firefox and Chrome.

Fixes #5056

Removed display: block to let the element be displayed inline and let
itself aligned by vertical-align: middle of the parent

This works in IE8 and other browsers.

Fixes #5288

use places/folder icon,
move link construction to JS,
only show icon on hover,
use 'searchresult' as css class name,
add filter/unfilter methods,
highlight searched files in current filelist
only filter when correct FileList is present

Frontend:
- The files app list now uses ajax calls to refresh the list.
- Added support the browser back button (history API).
- Added mask + spinner while loading file list

Backend:
- Added utility function in core JS for parsing query strings.
- Moved file list + breadcrumb template data code to helper
  functions
- Fixed some file paths in trashbin app to be similar to the files app

unify .original div to fix css in firefox, clear:left to fix filename wrapping in chrome, shrink width of columns and get rid of ie8 hack

IE8 is not happy with the :checked CSS3 selector which causes it to
ignore the whole rule.

Replace it with a more compatible selector.