* New helpers ynh_backup_after_failed_upgrade and ynh_backup_before_upgrade
Create a backup at the beginning of upgrade script.
Then, if the upgrade script failed, remove the app and restore it.
The backup is kept, to provide a way to restore if the upgrade is finally a bad thing.
* Implement @JimboJoe's comments
* Indentation
* --ignore-hooks -> --ignore-system
* New helper ynh_setup_source
THE trollest helper :D
An helper to handle download, checksum, copy, patches, extra files and even a way to install without internet connection.
Really usefull to simplify this part of the packaging.
* [fix] Source id and pkg _dir missing, strip-components deactivation
* [fix] Replace tab by 4 spaces
* [fix] False default value in ynh_setup_source helpers
* [fix] Empty var failed on set -u into ynh_setup_source
* [fix] Multiple patch on setup sources helper
* [fix] Doc, patch and extra_file in ynh_setup helpers
* [enh] Allow to use ynh_setup_source in another dir
* [fix] Doc ynh_get_plain_key
* [fix] Missing default value in ynh_setup_source
* Missing closing } after merge with unstable ?
* New helper ynh_curl_abstract
Just an abstraction around curl command.
To prevent forgot arguments and simplify this difficult command.
* [enh] Switch args of ynh_curl_abstract
* [enh] Rename ynh_curl_abstract into ynh_local_curl
* Splitting the various key=value into several arguments
* Comment to clarify bash command
* Adding comment about $domain and $path_url
