added PAL60 specification. even though it isn't a real specification it
is more convenient and provides better user feedback
moved FrameInfo into frameinfo package, now called Current as in
frameinfo.Current
clarified storage of requested specification by the television:
how the television is probed for the specification has changed, in
particular the current spec is retreived via the GetFrameInfo()
function. in fact, this was how most other packages did it but there
also existed a GetSpecID() which was uncessary
GetReqSpecID() and GetCreationSpecID() removed, replaced with
GetResetSpecID() and IsAutoSpec()
simplified SetSpec(). removed the force argument
removed reset option for vcs.AttachCartridge()
tracker package uses television spec ID correctly
movie cart tested for PAL60. it should be PAL-M
rewind search functions uses the TV spec of the main emulation
command line "performance" and "regress add" -spec option renamed to -tv
template for TV terminal command uses specification.ReqSpecList
notifications interface instance moved to environment from
cartridgeloader. the cartridgeloader package predates the environment
package and had started to be used inappropriately
simplified how notifications.Notify() is called. in particular the
supercharger fastload starter no longer bundles a function hook. nor is
the cartridge instance sent with the notification
AudioTick() function in tracker interface accepts TrackerEnvironment
instance. tracker implementation differentiates emulation instances and
records AudioTick() information accordingly
