[entropy.core] expose the coloured output setting to entropy.conf, fix bug #4283
[entropy.server] add removed_reverse_dependencies_test() to repo tests
Release Entropy 206
Tagging Entropy version 206
Merge remote-tracking branch 'upstream/master'
[entropy.spm] PortagePlugin: use returnpid=True with portage.doebuild()

Latest Portage versions have problems with writing to proper stdout/stderr
fds and they don't either respect sys.{stdout,stderr} nor fd_pipes if
returnpid=False.
Workaround the situation by using returnpid=True as mandated by the
portage.doebuild() API specifications.
Release Entropy 207
Tagging Entropy version 207
[entropy.server] scan_package_changes: add new keyword arguments

Add repository_ids and removal_repository_ids arguments.
[entropy.server] removed_reverse_dependencies_test: return complete information
[entropy.server] fix colors
Revert "[entropy.spm] PortagePlugin: use returnpid=True with portage.doebuild()"

This reverts commit 8bfcfd8e35f7431155f535a3ab98e624cbc692a6.
Release Entropy 208
Tagging Entropy version 208
[entropy.security] make instance variables protected
[entropy.security] System: make it a new-style class
[entropy.security] make op_mappings protected
[entropy.security] start System class refactoring, clean __init__

__init__ was fat and slow, this commit cleans the whole class code
and dramatically improves the initialization speed.
[entropy.security] System: complete migration to self.SECURITY_DIR
[entropy.security] simplify the Security advisories and fetch code