[FIX] various layout fixes for web client

* fallback support for browser without calc,
* invisible pager in some cases
* correct colors for oe_stars
* readd oe_webclient class
[FIX] fix bouncing problem on create/import buttons

the bouncing is supposed to occur when clicking on the area in view list
with no content.  Problem was that the Create button was separated from
the import button while bouncing.  This commit fixes the issue in a not
really subtle way: it instead bounces the whole row.  I tried to find a
better fix, but I don't like jqueryui and i don't want to spend too much
time on this.
[FIX] fix an issue with non-displayed favorite filter

If someone removes the last filter in favorites menu, it removed the
divider, and therefore couldn't properly add a new filter.