Work round bug in XML parsing.

bsps:
	* zed_E64G4_512mb/zed_E64G4_512mb.xml: Don't put newline between
	attributes - to avoid bug in XML parsing!
Allow cleaning before building and debug versions of libraries.

	* build-libs.sh: Take arg -c to clean before building and -d to
	build Debug rather than Release versions.
Fix files to be build for Debug version of e-server.

src/e-server:
	* Debug/src/subdir.mk: Bring files into line with Release version.
Fix const to non-const argument coercion.

src/e-xml:
	* src/epiphany_xml.cpp (int EpiphanyXML::Parse): Cast
	m_platform->libinitargs to char ** (really should be const, but
	that needs bigger changes).
Add "info os", tidy up "info os processes".

src/e-server:
	* src/GdbServer.cpp (GdbServer::rspOsData): Created.
	(GdbServer::rspOsDataProcesses): Tidy up trace message, no space
	after commas in list of cores, print cores as 4 char octal.
	* src/GdbServer.h: Add osInforeply and rspOsData.