Force integer values for charts; fixes #742
Typo, fixes #744
Multiple elements with same ID; fixes #736
Do not try to store a new mailing if we're previewing, fix attachments on stored mailings

fixes #734
Fix mailing history ordering
Make sure tmp_path is set when we create a new id

Attachments can be removed on mailing cancel ths way.
Create new directory on mailing copy; fixes #743
Update translations
Unset tmp_path when just loading a Mailing from history
New website URI
Dynamic fields on transactions; fixes #745
Fix a creation date issue while importing
Check if status exists when creating member; fixes #739
Prevent double load of attachments
Update changelog
Bump version
Merge branch 'release/0.7.7' into develop
Initialize GALETTE_LOG_LVL for tests also
Align comments
Add release date for plugins; fixes #544