VISTA related internal documents

WP2: This is the location of PSB's WP2 files. VISTA documents not directly
linked to WP2 can be found in internal/vista/misc or internal/vdfs.

misc:  General VISTA documentation, not for general release and not directly
related to WP2.

etcfiles:  Files related to work on the VISTA Exposure Time Calculator

FDR:  VISTA IR camera FDR specific documents

proposals: Proposals for the VISTA Public Surveys