ufed-0.91 release

ChangeLog
---------
Note: As ufed-0.90 is now skipped, the following list contains all changes from
      ufed-0.90_rc1, ufed-0.90_rc2 and ufed-0.91.

- (0.90) Added a filter for local versus global USE flags.
- (0.90) Added a filter for installed versus all USE flags.
- (0.90) Added parsing of /etc/make.profile/package.use.
- (0.90) The profile /etc/portage/profile is now used as last profile to
         respect user overrides.
- (0.90) Added parsing of use.force and package.use.force in the profiles.
    These are added as masked but enabled flags.
    Prefix '-' reverts the masking and the forced enabling
- (0.90) Added parsing of use.mask and package.use.mask in the profiles.
    These are added as masked but disabled flags.
    Prefix '-' reverts the masking
- (0.90) Removed obsolete file references.
- (0.90) Updated documentation.
- (0.90) ufed no longer breaks if FEATURES contain invalid values.
- (0.90) Added a filter for masked/forced versus normal USE flags.
- (0.90) Added toggling of the package list display.
- (0.90) Added handling setups where /etc/portage/make.conf is a directory.
- (0.90) Read PORTDIR and PORTDIR_OVERLAY from portageq, too.
- (0.90) Searching and cursor placement is now reliable.

- (0.91) Added description line wrapping.
- (0.91) Key help buttons are now dynamic dynamic (text, placement and width).
- (0.91) Replaced status indicator with a dynamic status line.
- (0.91) ufed does no longer error out when USE in make.conf is exceptionally
         large.
- (0.91) The deprecated 'portageq envvar' is no longer used to determine
         PORTDIR and PORTDIR_OVERLAY, eix is used if available and portageq
         with the get_repo(s|_path) command as a fallback.
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