Patterns support#2

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g7 wants to merge 9 commits intomasterfrom

Commits on Jan 12, 2016

Commits on Jan 18, 2016

[apt_handler] Renamed updates to apt_handler
g7
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Commits on Jan 22, 2016

[apt_handler] Handle get_update_infos() failures
g7
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Commits on Feb 26, 2016

[apt_handler] Switch to a libchannels-global DynamicCache
g7
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[apt_handler] Added new methods check_relationship() and check_relationships()
g7
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Commits on Mar 9, 2016

[apt_handler] Recreate the package_manager object after clearing the cache
g7
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Commits on Apr 16, 2016

[apt_handler] get_update_infos(): catch a broader range of Exceptions
g7
committed