Add skeleton for python replacement of detect-well-known-errors

Contains the main section loop, and establishes the working directories
kpr (and eventually tpl) extensions are renamed, to allow side-by-side
evaluation against the original bash script.
detect_well_known_errors.py - Clean obsolete kpr and bug files.
detect_well_known_errors.py - Add class for handling known problems.
detect_well_known_errors.py - Add has_problem() detection method.

For a given Problem class instance, determine if a given log file
body contains the problem.
detect_well_known_errors.py - Create missing kpr files.
detect_well_known_errors.py - Create Failure Mgr class to hold kpr fails.
detect_well_known_errors - Create html tpl files.

Note that they are actually .tpln files, to support side-by-side
testing with the bash script.
detect_well_known_errors.py - Print failures to match bash script.

At this point, the python script has the same kpr, tpl, and command
outputs as the previous bash script, with the following caveats:

 * sort order has minor differences (non-alphanumeric char priority)
 * The COMMAND always shows on one line
 * command_not_found package list is a superset. Random inspection
   of the extra logs shows the Python script to be correct.
detect_well_known_errors.py - Change ext's to create kpr and tpl files.

The script can now replace the bash version
Remove bash detect_well_known_errors.
detect_well_known_errors.py - move to detect_well_known_errors.
detect_well_known_errors - Copyright notice.
detect_well_known_errors - Template HTML format fix.

There were one too many </tr>'s.
detect_well_known_errors - Integrate the package templates.

PKG_ISSUE_TEMPLATE can be replaced with the existing
PKG_ERROR_TEMPLATE.
detect_well_known_errors - Improve description in unknown errors HTML.
detect_well_known_errors - Sort known errors/issues by rdep count.
detect_well_known_errors - Display the reverse dependency count.
Bump the required python version to 2.7.

... to support argparse in detect_well_known_errors.
optparse is deprecated in the current version.
detect_well_known_errors - Restore recheck and recheck-failed options.
detect_well_known_errors - Add PTS link to issue/error entries.