Variable [compat]: Keep internal whitespace in string lists.

The compat code converting from TYPE_STRING to TYPE_STRING_LIST now
keeps internal whitespace.
Merge branch 'patches/stringlist-whitespace' into devel

* patches/stringlist-whitespace:
  Variable [compat]: Keep internal whitespace in string lists.
DBManager: Improved robustness of my.cfg patcher.

The characters '-' and '_' may be used interchangeably in my.cfg,
so make sure that we don't get confused by it.
DBManager: Add an innodb-data-file-path entry to my.cfg.

Attempt to autodetect a suitable value for innodb-data-file-path
if it hasn't been set, and there is an already existing ibdata1.
Merge branch 'patches/bug7264' into devel

* patches/bug7264:
  DBManager: Add an innodb-data-file-path entry to my.cfg.
  DBManager: Improved robustness of my.cfg patcher.
Bugfixed innodb-data-file-path handling.