modified config() methods in Core (Playlist, PlaylistElement, FadeInfo,
and AudioClip) to read ID as hexadecimal string & not decimal number
some config xml files and tests had to be modified accordingly
updated config files with title attribute
created getXmlString() method in AudioClip, Playlist, PlaylistElement
and FadeInfo
replaced old (and bad) toXml() method with getMetadataString() in AudioClip
and Ptr<Glib::ustring>::Ref to Ptr<const ... >::Ref
finished adding audio clip methods to WebStorageClient
modified helix install script to copy the splay executable to $LS/usr/bin
(HELIX_LIBS needs to be set to "$LS/usr/lib/helix/" for this to work)