potx 6.x-2.2

This release includes way better coder module integration and Drupal 7 parsing support. Detailed changes since 6.x-2.1:

• Preliminary support for parsing Drupal 7.x source files. There is already a hook_perm() change in Drupal 7 which does not have handler code yet, but things which work the same way in Drupal 6 should work still.
• #309875 by douggreen and myself: Update and improve coder integration
  
     - add the POTX_STATUS_STRUCTURED reporting mode
   - rework potx_status() to accept  and  separately, instead
     of integrating them into the messages in different random forms
   - automatically append file and line info in all but the structured
     reporting mode
   - slightly better messages where 'Invalid marker content' was before
   - updated to the latest coder API, using _coder_error() instead of theme('coder_warning', ...)
• #213868 by Dave Cohen, Freso and myself: check our required token PHP extension, so people know that the module has an external dependency to make it work.
• #306384 by Takafumi: incorrect arguments were passed to potx_get_header(), resulting in SQL errors
• #312523 by stella any myself: better error messages for potx errors / coder reviews.
  This expands on the existing structured reporting mode to separate the code excerpt, which we don't need in coder reviews.
  Also unifies how the excerpt appears; now with the file name and line in one sentence for easy error location spotting if potx is used outside of coder.
• #313789 noticed by stella, fix by myself: fix code review errors in potx module
• #309875 follow up by myself: coder counts lines from 0 not 1
• #306402 by myself: fix support for the new hook_perm() parsing with Drupal 7 code by skipping that Drupal 5/6 parser section. Drupal 7 now has native t() in hook_perm() so no reason to do magic.
• Remove bogus source strings from translation template
• More and improved test strings in potx-cli.php