remove unnecessary leading punctuation from logs and result names

Bug: 704160
Change-Id: I09ebf4d4248c20d7a9db9259077dc91b3b21d40e
truncate log filenames with an ellipsis at the end using CSS

... rather than only showing the last 50 characters, which are less
likely to be the distinctive part of a long log filename.

The choice of 20em for max-width is largely arbitrary, we need to set
some max-width for the overflow to be enforced (otherwise it just pushes
out the table width).

Bug: 600232
Change-Id: Ib9d6460e5cc16d71d045624f1646acdf5f0b2186
allow results table to overflow tab content div

Bug: 1014962
Change-Id: Id309231b0aeb3307405ea2d4989300caed1bcaec