Options specified in PPD files can be grouped using the
keywords "OpenGroup" and "CloseGroup".
The keyword "InstallableOptions" is used as a group name
for a group containing options that define
optional hardware features of the printer that can
be present or not (s. section 5.4 in version 4.3 of
the PPD specification).

As they are not print job specific, it is recommended
not to show them in the print dialog.

To be able to distinguish those options, the
PPD group name was added as an attribute to the PPDKey
class.

Reviewed-on: https://gerrit.libreoffice.org/19623Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>
(cherry picked from commit f8d0dc09)

Conflicts:
	include/vcl/ppdparser.hxx

Change-Id: I4a3abf23a711ad98556c0b608a07ef0a91e77e2b
Reviewed-on: https://gerrit.libreoffice.org/19630Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>
Tested-by: Jan-Marek Glogowski <glogow@fbihome.de>
(cherry picked from commit 2f03a169)