Add test for do STRING
Test map/grep/sort
Remove redundant restart_profile() method

It can be replaced by stop_profile() + enable_profile().
Allow calling enable_profile() after stop_profile()

It needs special treatment because stop_profile writes an end tag that makes
the aggregator discard state information.
Add sortable table from http://www.kryogenix.org/code/browser/sorttable/
Make all subs/all files tables sortables