Gallery Display plugin

This plugin will insert a gallery or a slideshow. A Marker is replaced with a
gallery template or slideshow type. The marker begins  with "{rsg2_display:"
and is folllowed by parameters and ends with "}" In the examples below a " "
is insterted so it doesn't match and try for unknown slideshow

{ rsg2_display: template, GID}
{ rsg2_display: template, GID, parameter=value, parameter=value, ...}

{ rsg2_display: slideshow_parth, 5}

{rsg2_display: slideshow_parth, 5}

{ rsg2_display: slideshowone, 5}

{rsg2_display: slideshowone, 5}

{ rsg2_display: slideshow_phatfusion, 5}

{rsg2_display: slideshow_phatfusion, 5}