fix RewritePlugin initialization

Error was introduced in 6d68a48
Merge pull request #73 from jhawthorn/rewrite_fix

fix RewritePlugin initialization
importfeeds migration: remove prefix (GC-503)
merge
fix the expanduser of the importfeeds dir configuration
importfeeds: add relative_to config
importfeeds: document the relative_to configuration option
Merge pull request #74 from phmongeau/relative_feeds

relative importfeeds m3u path
cleanup, docs, and changelog for relative_to (#74)
add thanks to changelog note for #74
allow convert to be used without embedart enabled
document migration from 1.0 to 1.1
input_options: fix highlighting when require is on

Previously, even when `require` was True, the first option was highlighted as
if it were the default.
Implements support for WMA/ASF

 * Adds support for importing/managing .wma and .asf files
 * Adds support for all available ASF tag equivalents
 * Adds two utility methods for (un)packing embedded ASF pictures
 * Modifies scrub plugin to work around the lack of a delete method on
   ASFTags object.
Safely cast ASFBoolAttributes

 * Modify _safe_cast to account for ASFBoolAttributes
Don't auto-tag partial matches.

Add `import: confirm_partial` setting, with a default of "no" (current
behaviour). If set to "yes", strong recommendations for partial matches will
be downgraded to medium recommendation, thus will require confirmation and
will not be auto-tagged.
Safer defaults on confirmation prompts.

Remove default option and require selection on confirmation prompts for:

- Partial matches, if `import: confirm_partial` setting is "yes".
- Matches that are below the medium recommendation threshold, but above the
  gap threshold.
- Matches that have no recommendation.
- Matches other than the best and auto-suggested match.
For matches with no recommendation, import as-is or skip automatically.

Add `import: none_rec_action` setting with a default of "ask" (current
behaviour). If set to "asis" or "skip", matches with no recommendation will be
imported as-is or skipped automatically.
Align LHS and RHS changes. Put track/duration differences on RHS.
Add docs for `none_rec_action` setting.