More flexible suggested support

[Berniyh]

Handling suggestions could be more flexible, if it would be possible to accept and ignore suggestions per package. An example:

# Automatically install packages subversion and konsole suggested in dev-util/kdevelop:kde-svn:
dev-util/kdevelop:kde-svn dev-util/subversion kde-base/konsole:kde-svn
# Ignore the suggestion dev-util/cvs in dev-util/kdevelop:
dev-util/kdevelop !dev-util/cvs
# Install every suggestion in kde-base packages:
kde-base/* *
# But drop suggestions on kmail:
*/* !kde-base/kmail:kde-svn

It should be possible from the user side to: - Automatically install every suggestion (in the example: */* *) - Drop every suggestion (in the example: */* -*) - Just show the suggestions (no rule for the suggestion in suggested.conf) - Do the above on a per package basis