add option to enable filtering of absolute file URIs in both execution log and detailed log

_From @ghost on April 13, 2014 0:29_

_From [josteinaj@gmail.com](https://code.google.com/u/josteinaj@gmail.com/) on June 20, 2013 17:03:46_

Messages in the execution log, the detailed log etc. should be filtered to remove all absolute file URIs.

A basic regex would be run on each line, replacing all absolute file: URIs with only the filename.

So "file:/home/jostein/filename?a&b#c" would be replaced with "filename?a&b#c".

See also issue daisy/pipeline-issues#182.

_Original issue: http://code.google.com/p/daisy-pipeline/issues/detail?id=332_

_Copied from original issue: daisy/pipeline-issues#332_